Woohoo, I'm back up and running... for the moment. Tried just about everything with my old PC, could not even get into the CMOS, it would count up the memory and stop. Swapped out everything on the board, cleared the CMOS, nothing worked. Just for the hell of it, I tried hooking up an old IDE hard drive, and it worked. Got into CMOS, set everything back up, hooked up the SATA drives, and nothing worked again. Before it got to CMOS, it said something about searching for IDE drives, and hung there. So, I hooked up a little 20GB IDE drive and both of my SATA drives, set one of the SATA drives as the boot drive in CMOS, and now I can get into Windows. As soon as I disconnect the IDE drive, I can't boot up any more, so I'll just leave it plugged in. I guess somewhere this makes sense...
Anyway, at least I'm not so frantic to get a new system, I can take a little time to research all the info you great folks have given me, and pick parts with a little more knowledge instead of rushing through the purchase. Thank god for Anandtech, where else can you get answers to frantic computer questions at 3AM. Thanks again for everyone's help, I'm off to back up as much as possible before this dinosaur dies out again.