How to Adjust CPU Fan Speed
The Central Processing Unit fan is a critical component in the overall operation of your computer. It is a fan that is attached to your computer's CPU to keep the processor from overheating. The harder the CPU has to work, the hotter it will get. In order to compensate for the extra heat the CPU fan should spin faster. If your computer is overheating constantly, the CPU fan speed needs to be adjusted. You can adjust the CPU fan speed by editing the option in your computer's BIOS settings.
Restart your computer. Press "Start" then "Shut Down" and select "Restart" from the list.
Press the "F10," "F8," "F2" or "Delete" key (depending on your computer's manufacturer) to enter the BIOS system. When your computer restarts it will briefly display a message stating how to enter the BIOS. Press the appropriate key to enter the system.
Use the arrow keys on your keyboard to move from one section of the BIOS to another. On many computer systems the mouse will not work in the BIOS.
Scroll through the tabs using the arrow keys until you get to the option to change the CPU fan speed. The BIOS system of different computers will vary. For example, the option to change the fan speed will be under "System Setup" on one computer but under "Configuration Settings" in another. Look under each tab until you find "CPU fan speed."
Press the "+" key, the "-" key or the "Enter" key to change the fan speed option. The system will display which key to use. Scroll through the options until you find the speed you want. Look for the option to "Save and Exit" and press the "Enter" key to exit the BIOS. Your computer will either automatically restart or continue booting up depending on the manufacturer, with the new fan speed saved.