Old Macs, fan whine, and video cards
I get quite a few hits on my complaint about my husband’s old PowerMac making a ton of fan noise. At last, at last, he took it in to the shop and had it checked out. (Oh, and for the record, the machine’s a G4/450, not 350 as I said at the time.)
Well. It wasn’t the main fan on the power supply, because that went dead ages ago. Why the machine never burned our house down I’m sure I don’t know.
The noise problem had to do with the video card fan. Solution: buy another video card. Which I have done, and let us all hope for the best.