Well, it looks like my desktop has joined the bleeding choir invisible. The power supply was indeed gone but, apparently, it took the motherboard with it. Guess I'm now in the market for a barebones kit to add my components into.
I'll need a motherboard that has an AGP video slot and I may need new ram chips as my old comp used DDR ram as opposed to DDR2. Fortunately, the new power supply and hard drives are fine. Might as well add a DVD Rom drive while I'm at it.