My jalopy of a PC started buzzing today. More accurately, the fan started buzzing. I decided it might be dust jammed in a bad spot, so I unbolted the power module and spent a half hour blasting the thing with compressed air and sticking Q-tips in places they probably don’t belong. (Of course, many Q-tips in America are probably being stuck in places they don’t belong.) It apparently worked. The buzzing went away.
(While looking up the URL for “Q-tips”, I discovered that the manufacturer offers a booklet on how to use Q-tips. Who needs instructions for Q-tips? Of course, I’m going to have to order that, just to find out what the official instructions are. It would be really embarassing if I’d been using them incorrectly all these years.)n