If you and looking for quality computer parts Tiger Direct is also a good place to start looking. Very cheap and good quality! A new fan shouldn't be very expensive. Usually loud fan noise comes from dust gathering on the blades and throwing them out of balance, a good shot of air usually works.
Might want to open the case. It could be the main cooling fan. But it might also be a fan on the video card. I have had several of our workstations that have nice video cards that have fans on them go bad. Sometimes it is hard to tell where the racket is coming from without opening the case.
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