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If its the CPU fan you could try this...
Unplug computer from the wall and then unplug the cpu fan from the motherboard. Take some compressed air and blow it into the cpu fan to clean out the dust. When you are satisfied you have cleaned out the dust, PLUG THE CPU FAN BACK IN, and plug the computer into the wall again. Now see if the noise is still there. If it is, it could just be a generally noisy fan. Newegg.com has some fairly cheap and quiet fans if you want to buy a new one.
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