How to Disable a CPU Fan Speed Sensor

The CPU fan sensor is included with some motherboards to help ensure the computer and the CPU do not overheat. One way this sensor works is that the sensor will shut down the computer and not allow it to turn on if the CPU fan is not working. Without the CPU fan, some CPUs will quickly overheat and destroy themselves. You should only turn the CPU fan sensor off if you know what you are doing and only for a very short time.

Difficulty: Moderately Easy

Instructions

1. Shut your computer down if it is on; then restart it.

2. Enter your BIOS set up. Read your screen when the computer starts to determine how to do this. Many systems will say "Press Del to enter set up," or they may ask you to press a different key. This will happen long before you see any operating system screens. If you see an operating system screen, you missed the BIOS start-up options and need to start your computer again.

3. Use the arrow keys to navigate through the BIOS system. Each BIOS manufacturer has a different setup, but all will allow you to use the arrow keys for navigation. You are looking for a section regarding "Power Set up" or "CPU Options."

4. Use the arrow keys to navigate to the option that indicates the CPU fan. In many BIOS systems, this will include the current temperature of the CPU or the actual speed of the fan.

5. Press the "Enter" key to change the setting. Keep pressing the "Enter" key (or the "+" key in some configurations) until the setting for the CPU fan is "Off." Your CPU fan speed sensor is now disabled, and your computer will continue to run when the CPU fan is not operating.

Tips & Warnings

• Heat is the enemy of your computer. Your CPU must be kept cool for your computer to function.
• Disabling the CPU fan sensor can completely destroy your CPU, the most expensive part of your computer, in a short time.