I have a 2008 Mac Pro that has quite a noisy CPU fan, the large one on the front. It's sometimes really bad and sometimes just an annoying, droning sound. My CPU fan is running at 499RPM usually, which seems pretty slow for the amount of noise it's making. The droning fan sound is like Chinese water torture to my ears, so I'd like to get rid of it. It's a bit louder than an iMac G5 but more rickety-sounding. My temperatures are normal. I think it's a mechanical problem with the fan itself. I've tried blowing air from one of those pressurized air cans into there, opening the computer and cleaning it without removing any parts, and running the fans at max speed to try and dispel dust. None of this had any effect. Is this happening to anyone else here? And have you managed to fix it on your Mac Pro? I'm thinking about oiling the fan or replacing it, but I don't know if that's necessary. Maybe taking it out and cleaning it thoroughly would help, but I don't know how to do that, and none of the tutorials I can find work. EDIT: In case anyone else was going to recommend this, SMCFanControl would not solve this. The fan speeds and temperatures are normal.