If it is your PSU fan you can replace it, but be very careful. Pretty good chance of getting shocked. I would disconnect from AC for at least 24 hours. But, I would try cleaning out all the fans first with some compressed air (can from like Radio Shack.) If you have a really dusty fan it might not be spinning up like it should and could be the cause of the noise. Try all the simple things before throwing money at it. Good luck!
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