Turns out it was the Delete key. I'd already checked the manual and the Biostar website and searched Google, no information. A tech at a nearby computer store said it was the Delete key, thanks.
BioStar never answered this technical support line. :|
Good thing I went to the BIOS, as you have to manually set the M7NCD's FSB for the Barton 2500+ CPU to 166x2, the motherboard had it set to 133x2 so it had been running underclocked.
-PCM