One thing I'd suggest is to try booting up your PC with the case off (just power on) with one item at a time disconnected

I've already done that. The cooler of the video card is the noisiest by far.
It's also the one I don't really know what to do about. I'm hoping one of the BBS users will be able to point me in the direction of an alternative cooler.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup