I know this has been addressed before but the solution does not match my problem. There is a loud buzzing noise coming from my Dimension 8200. I have had the power supply and CPU fan replaced. It seems to be a vibration from the tower itself. If I put pressure on certain areas of the case, it would stop vibrating. This is driving me nuts and makes me hate to use the Dell PC. Please let me know if there are ways to resolve this. Thanks.
ummmmm,Duct tape maybe? What areas do you put pressure on for the noise to stop? Sounds like something is loose on the case. Not really a hardware failure,Try and tighten all the screws you see,check your connections,etc.. See if that helps. Reply back if it did or didnt.