Okay, so the DIMM's aren't messed up because my comp runs perfectly when overclocked with PC2100 in it (OC'd to 294MHz), yet it won't run the PC3200 at any speed.
And yes, I've tried multiple slots. I do have one fried slot that I don't touch, but both of the others work fine with my mem in it, but when I toss in the PC3200, it doesn't work. Do you really think that it is merely incapable of clocking down to my MoBo's FSB speed, or is there something more wrong (since the RAM is obviously error free).
I am thinking that this is the problem:
I built my g-parents a new comp, and was unsuccessful at installing Windows in it. I believed that this was due to the RAM, but I now think that it's due to the defective motherboard, and once replaced, the computer will install WinXP just fine. I have also been attempting a clean WinXP install on my parents' computer with a matching stick of RAM. I think the RAM-MoBo compatibility is at fault here, because they have the same MoBo as I do, and I can't get my (otherwise fully stable) comp to run with that type of RAM. So the RAM is at fault in both my and their computer, but not because it's defective, just because it's incompatible. I guess I'll just have to give all that RAM to the new g-parents' computer, and buy some PC2700 for my comp. Meh.
Thanks Nubius for your help