OK, here's the end of the story: (Please, Dear God, let this be the end!)
It's back in the shop.
They're going to give me a 'good deal' on (yet another) power supply, AND [OH, THANK YOU] a 528 vid card, for just another $200. AND, they swear, an in-store one-year guarantee on all parts.
BECAUSE MY OLD COMPUTER HAS CEASED TO EXIST. EVERY PART HAS BEEN REPLACED. (Or lied about in gossip magazines)
End of story, and, the moral : If your computer is not working, just throw it away, and buy a new one, Elvis.
Because Prescilla thinks you should.
Plus, I'm going back tomorrow morning to pick up the big computer, and, I know it's going to fail here after ten minutes.
THIS IS SO BEAUTIFUL