Remove the Old Heatsink and Fan
The first thing that must be done to replace a CPU cooling fan is to remove the old heat sink and fan from the computer. The computer should be completely unplugged before doing so. The power button should be pushed again in order to discharge any additional power that might still be left in the power supply. Make sure to maintain contact with the metal components of the computer case or other grounded surface when working on the computer so as to prevent damage to the internal components that can be caused by static discharge.
Care should be taken when removing the old heat sink. Not only should the screws or clips holding it in place be removed gently so as to prevent damage to the motherboard, but the heat sink itself should be removed carefully as it may be stuck to the CPU with hardened thermal paste. Unplug the CPU fan from the motherboard before attempting to remove it in order to prevent accidentally damaging the motherboard. Once the heat sink and fan have been removed from the case they can be set aside.
Preparing the New Heat Sink and Fan
Check to see if the new heat sink comes with thermal paste already applied or if you will need to apply your own. If new thermal paste needs to be applied, use a thin layer and then scrape it off gently so that any scratches or contours will be filled. A second layer may then be applied, again making sure that only a thin layer is used. Any remaining thermal paste still on the CPU from the old heat sink should be very carefully removed using rubbing alcohol or acetone applied with a cotton swab and then allowed to evaporate completely.
Installing the New Heat Sink and Fan
The new heat sink and fan should be installed securely, making sure that the mounting brackets hold it firmly against the CPU. The thermal paste that was applied to the bottom of the heat sink will assist in heat distribution, helping to keep heat moving from the CPU into the heat sink so that the fan can distribute it away from the sensitive processor. Once the mounting screws or clips have been replaced, plug the new fan into the motherboard so that the fan will be operational as soon as the computer is turned on.
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