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Cooling fan to CPU are come along with the CPU. You can use any other fan, having speed regulator pin, ie, the connector wire to it will have three conductors. Keep a close look at the size and seating screws to its body to the heat-sink of the CPU. http://electronicshelponline.blogspot.com/
You may need to clean the fan and heatsink of dust. See the dust restricts the cool air from reaching the heatsink and this in turn causes your fan to spin faster. The computer's BIOS is programmed to increase CPU fan speed as CPU tempreature increases. If your fan is very loud, then it is running at the maximum speed possible. A clean heatsink will decrease the Processor's temperature.
Installing additional fans in your computer's chassis is an effective way of bringing the temperatures down. Install the biggest fans that your chassis supports. 120mm fans are better than 80mm fans as they can spin at slower speeds to provide the same airflow of a smaller fan. Therefore giving you a quiet computer.
Use a program called Speed Fan to ensure that your fans are indeed running at the desirable level of 100%
What do you mean by Quiet it down? If the fan is running at an excessive speed, try to look in the Bios (Hardware monitor) settings to set the CPU fan to auto. This will provide a balance between fan speed and cooling.
If the fan itself is mechanically noisy, then you are probably looking at a shot bearing, causing it to run noisily. For the cost of a new heatsink and fan (about £20.00), its worth considering replacing it
Your computer is automatically shutting down to prevent damage to the CPU because it is getting too hot. This can be caused due to a malfunction fan, heatsink, or dirt inside the CPU.
Remove the side cover of the CPU. Using a can of air (which can be purchased at most electronics departments), blow out any dust inside the case, paying specific attention to the fan and the heatsink mounting the CPU. Also blow out all vents and anywhere else you see dust. Do not shake the can of air and keep it as level as possible. If you do not have a can of air available, an air compressor will work. Alternatively, you may vacuum the dust up with the hose of a vacuum cleaner but do not use any attachment with brushes on it.
If the inside is relatively dust free, check to make sure all the fans are functioning properly. If the one on the CPU is not, then that fan will have to be replaced.
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You mite not want to reset this. This could be telling you that your fan is faulty/Dieing. If so then if it doesn't turn off your comp, your CPU will fry from the heat. Try replaceing your CPU fan within your computer. "Cool Master" is a good brand. you can find them at any Fry's Electronics Store.