Yatta! I got it working again! There was something in my BIOS settings that either didn't show, or I didn't understand. I tore down my PC to the essential items (a useful tool I'd forgotten to use), then had the BIOS RE-detect my IDE devices after I reset it. I got some weird results. First, it didn't detect -anything!- I went to the Primary Master slot, where I'd plugged in my hard drive, and poked around, but none of the settings I understood seemed like they would help me, so I had it detect again. And my hard drive shows up... Same thing happened when I plugged in my CDROM, but after I got those running I wiped the hard drive and I'm up and running now! On my own computer, too! (I've been posting off another machine, a spyware-ridden 266 Celeron. Anyone want a paperweight?)
Anyway, thanks for the help! It took a while, but we got it settled, and I guess the next guy that comes here with this problem will have a ready solution waiting, at least. I love you all, but I hope you'll understand that I never want to see you ever again.
Ja, matta!