Computer system and its cooling control method

Claim 2

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 3

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said and first and second threshold temperatures is changeable by a user.

Claim 4

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said and first and second threshold temperatures is changeable by a user.

Claim 5

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, wherein said fan control means also changes the rotational speed of said cooling fan, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 6

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, wherein said fan control means also changes the rotational speed of said cooling fan, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 7

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to rotate said cooling fan at a first rotational speed while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to rotate said cooling fan at a second rotational speed while the second temperature detected by said second temperature sensor is not less than the second threshold temperature and the first temperature detected by said first temperature sensor is less than the first threshold temperature.

Claim 8

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to rotate said cooling fan at a first rotational speed while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to rotate said cooling fan at a second rotational speed while the second temperature detected by said second temperature sensor is not less than the second threshold temperature and the first temperature detected by said first temperature sensor is less than the first threshold temperature.

Claim 9

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 10

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 11

The system according to claim 5, further comprising means for, when the temperature detected by said first temperature sensor has become not less than the first threshold temperature, controlling to selectively one of i) decreasing the operation speed of the CPU and ii) increasing the rotational speed of said cooling fan.

Claim 12

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines the rotational speed of said cooling fan on the basis of the informed temperature sensor ID.

Claim 13

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines the rotational speed of said cooling fan on the basis of the informed temperature sensor ID.

Claim 14

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed, wherein said cooling fan is an exhaust fan for exhausting air outside said computer system that accommodates the first and second devices, and said system further comprises an inlet fan for taking outer air into said computer system; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 15

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a cooling fan having variable rotational speed, wherein said cooling fan is an exhaust fan for exhausting air outside said computer system that accommodates the first and second devices, and said system further comprises an inlet fan for taking outer air into said computer system; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 16

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 17

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 18

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said first and second threshold temperatures is changeable by a user.

Claim 19

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said first and second threshold temperatures is changeable by a user.

Claim 20

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means also changes the number of cooling fans, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 21

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means also changes the number of cooling fans, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 22

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to drive a first number of cooling fans while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to drive a second number of cooling fans while the second temperature detected by said second temperature sensor is not less than the second threshold temperature and the first temperature detected by said first temperature sensor is less than the first threshold temperature.

Claim 23

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to drive a first number of cooling fans while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to drive a second number of cooling fans while the second temperature detected by said second temperature sensor is not less than the second threshold temperature and the first temperature detected by said first temperature sensor is less than the first threshold temperature.

Claim 24

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 25

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 26

The system according to claim 13, further comprising means for, when the temperature detected by said first temperature sensor has become not less than the first threshold temperature, controlling to selectively one of i) decreasing the operation speed of the CPU and ii) increasing the number of cooling fans to be driven.

Claim 27

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a first device to be cooled; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal; and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines the number of cooling fans to be driven on the basis of the informed temperature sensor ID.

Claim 28

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a first device to be cooled; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal; and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines the number of cooling fans to be driven on the basis of the informed temperature sensor ID.

Claim 29

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device: a plurality of cooling fans, wherein said plurality of cooling fans are exhaust fans for exhausting air outside said computer system that accommodates the first and second devices, and said system further comprises an inlet fan for taking outer air into said computer system; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 30

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device: a plurality of cooling fans, wherein said plurality of cooling fans are exhaust fans for exhausting air outside said computer system that accommodates the first and second devices, and said system further comprises an inlet fan for taking outer air into said computer system; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 31

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 32

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 33

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said first and second threshold temperatures is changeable by a user.

Claim 34

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein at least one of said first and second threshold temperatures is changeable by a user.

Claim 35

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means also ON/OFF controls said first and second cooling fans, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 36

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means also ON/OFF controls said first and second cooling fans, based on whether or not the first temperature detected by said first temperature sensor has become less than a third threshold temperature and whether or not the second temperature detected by said second temperature sensor has become less than a fourth threshold temperature, and the third threshold temperature is less than the first threshold temperature and the fourth threshold temperature is less than the second threshold temperature.

Claim 37

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to drive said first cooling fan while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to drive said second cooling fan while the second temperature detected by said second temperature sensor is not less than the second threshold temperature.

Claim 38

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means controls to drive said first cooling fan while the first temperature detected by said first temperature sensor is not less than the first threshold temperature, and said fan control means controls to drive said second cooling fan while the second temperature detected by said second temperature sensor is not less than the second threshold temperature.

Claim 39

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 40

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first device is a CPU, and said system further comprises means for decreasing an operation speed of the CPU when the first temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 41

The system according to claim 21, further comprising means for, when the temperature detected by said first temperature sensor has become not less than the first threshold temperature, controlling to selectively one of i) decreasing the operation speed of the CPU and ii) driving said first cooling fan.

Claim 42

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines a corresponding one of said first and second cooling fans to be driven on the basis of the informed temperature sensor ID.

Claim 43

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said fan control means includes: means for, when the first temperature detected by said first temperature sensor is not less than the first threshold temperature, informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, and means for, when the second temperature detected by said second temperature sensor is not less than the second threshold temperature, informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, and wherein the CPU determines a corresponding one of said first and second cooling fans to be driven on the basis of the informed temperature sensor ID.

Claim 44

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first and second cooling fans are exhaust fans for exhausting air outside said computer system that accommodates the first and second devices, respectively, and said system further comprises an inlet fan for taking outer air into said computer system.

Claim 45

A computer system comprising: a first device to be cooled; a second device to be cooled, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature, and wherein said first and second cooling fans are exhaust fans for exhausting air outside said computer system that accommodates the first and second devices, respectively, and said system further comprises an inlet fan for taking outer air into said computer system.

Claim 46

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a rotational speed of said cooling fan, based on results of the determining step.

Claim 47

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a rotational speed of said cooling fan, based on results of the determining step.

Claim 48

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a plurality of cooling fans, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a number of cooling fans to be driven, based on results of the determination step.

Claim 49

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a plurality of cooling fans, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a number of cooling fans to be driven, based on results of the determination step.

Claim 50

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a first cooling fan which is arranged to lower a temperature related to said first device, a second cooling fan which is arranged to lower a temperature related to said second device, a first temperature sensor which is arranged to detect the temperature related to said first device, and a second temperature sensor which is arranged to detect the temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and ON/OFF controlling said first and second cooling fans, based on results of the determining step.

Claim 51

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a first cooling fan which is arranged to lower a temperature related to said first device, a second cooling fan which is arranged to lower a temperature related to said second device, a first temperature sensor which is arranged to detect the temperature related to said first device, and a second temperature sensor which is arranged to detect the temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and ON/OFF controlling said first and second cooling fans, based on results of the determining step.

Claim 52

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 53

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a cooling fan having variable rotational speed; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a rotational speed of said cooling fan, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes the rotational speed of said cooling fan when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 54

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 55

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a plurality of cooling fans; a first temperature sensor which is arranged to detect a first temperature related to said first device; a second temperature sensor which is arranged to detect a second temperature related to said second device; and fan control means for changing a number of cooling fans to be driven, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means changes a number of cooling fans to be driven when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 56

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 57

A computer system comprising: a first device generating heat; a second device generating heat, said second device being different from said first device; a first cooling fan which is arranged to lower a first temperature related to said first device; a second cooling fan which is arranged to lower a second temperature related to said second device; a first temperature sensor which is arranged to detect the first temperature related to said first device; a second temperature sensor which is arranged to detect the second temperature related to said second device; and fan control means for ON/OFF controlling said first and second cooling fans, based on at least one of the first temperature detected by said first temperature sensor and the second temperature detected by said second temperature sensor, wherein said fan control means causes at least one of said first and second cooling fans to be rotated when said first temperature sensor detects the first temperature has become not less than a first threshold temperature, and when said second temperature sensor detects that the second temperature has become not less than a second threshold temperature.

Claim 58

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a rotational speed of said cooling fan, based on results of the determining step.

Claim 59

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a rotational speed of said cooling fan, based on results of the determining step.

Claim 60

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a plurality of cooling fans, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a number of cooling fans to be driven, based on results of the determination step.

Claim 61

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a plurality of cooling fans, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and changing a number of cooling fans to be driven, based on results of the determination step.

Claim 62

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a first cooling fan which is arranged to lower a temperature related to said first device, a second cooling fan which is arranged to lower a temperature related to said second device, a first temperature sensor which is arranged to detect the temperature related to said first device, and a second temperature sensor which is arranged to detect the temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and ON/OFF controlling said first and second cooling fans, based on results of the determining step.

Claim 63

A cooling control method for use in a computer system having a first device generating heat, a second device generating heat, a first cooling fan which is arranged to lower a temperature related to said first device, a second cooling fan which is arranged to lower a temperature related to said second device, a first temperature sensor which is arranged to detect the temperature related to said first device, and a second temperature sensor which is arranged to detect the temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; and ON/OFF controlling said first and second cooling fans, based on results of the determining step.

Claim 64

A cooling control method for use in a computer system having a first device including a CPU to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; changing a rotational speed of said cooling fan, based on results of the determining step; and decreasing an operation speed of the CPU when the temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 65

A cooling control method for use in a computer system having a first device including a CPU to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; changing a rotational speed of said cooling fan, based on results of the determining step; and decreasing an operation speed of the CPU when the temperature detected by said first temperature sensor has become not less than the first threshold temperature.

Claim 66

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; changing a rotational speed of said cooling fan, based on results of the determining step; informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, when the temperature detected by said first temperature sensor is not less than the first threshold temperature; informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, when the temperature detected by said second temperature sensor is not less than the second threshold temperature; and causing the CPU to determine the rotational speed of said cooling fan on the basis of the informed temperature sensor ID.

Claim 67

A cooling control method for use in a computer system having a first device to be cooled, a second device to be cooled, a cooling fan having variable rotational speed, a first temperature sensor which is arranged to detect a temperature related to said first device, and a second temperature sensor which is arranged to detect a temperature related to said second device, said method comprising the steps of: determining whether or not a temperature detected by said first temperature sensor has become not less than a first threshold temperature and whether or not a temperature detected by said second temperature sensor has become not less than a second threshold temperature; changing a rotational speed of said cooling fan, based on results of the determining step; informing a CPU of said computer system of a temperature sensor ID indicating said first temperature sensor using an interrupt signal, when the temperature detected by said first temperature sensor is not less than the first threshold temperature; informing the CPU of said computer system of a temperature sensor ID indicating said second temperature sensor using an interrupt signal, when the temperature detected by said second temperature sensor is not less than the second threshold temperature; and causing the CPU to determine the rotational speed of said cooling fan on the basis of the informed temperature sensor ID.