The CPU is the heart of a desktop computer, carrying out millions of processes a second in order to run an operating system and other programs. This intense processing causes the CPU to generate a considerable amount of heat, which is usually channeled away from the CPU by a heat sink--a collection of conductive metal structures that are in contact with the CPU--and a fan, which blows hot air away from the CPU. Since a CPU's fan runs whenever a computer is on, it is common for them to burn out, or get old and be less effective.
Instructions
1. Open your computer case. Most computer cases can either be opened by snapping some easy-release mechanism, or by using a screwdriver to remove several screws from one side of the case. When the case is open, lay the computer down on its side, so you can easily see the fan and other components.
2. Remove the old CPU fan. The CPU fan is usually a fairly large fan screwed down right into the motherboard, on top of a heat sink. It should be easy to spot. Use your screwdriver to unscrew the fan and disconnect the fan from the motherboard or power supply, then set it aside.
3. Install the new CPU fan. You should never run your computer without a CPU fan installed, since the CPU will likely heat to a critical level, forcing the computer to shut down to prevent internal damage. When looking for a replacement fan, make sure to buy one that is the same size as the old one, so it fits the case and can be screwed into the same spot. If your old fan worked well, the most sure way to get a fan that will work is to buy the same fan. The fan should have some markings on it that will help you determine what kind of fan it is. When you have your replacement fan, simply screw it into the spot where the old one used to be, and connect the fan to the motherboard or power supply as necessary.
4. Start up the computer with the case still open to make sure the fan is running properly. After this test, shut down and close the case up.
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