My machine has emerged from its back-alley surgery successfully! I guess it's a good thing that grounding wasn't all that important, since I didn't bother with a bracelet and opened the thing up before any of you guys posted that advice. :tongue2:
Anyway, the eBay fan is working great. It's moving air and is whisper quiet. It was a real bitch to get in there (I couldn't get the case completely disassembled), but I got it enough to poke and prod and pull everything I needed to to get the job done. I also had to shake the thing like mad a couple times to get out a couple screws I dropped. :tongue2: That scared the shit out of me for a while.
Anyway, thanks for all the helpful (and not so helpful) advice. Reps for everyone who chimed in!