Sometimes works if you hold down the Ctrl or Del or mebbe insert key and keep it held down while you power on the comp. Diff boards use a diff key tho but usually one of them.
With Abit boards holding down the insert key as you power on is supposed to force to default bios settings, always assuming you did not completely hose the bios chip.
I hosed one long ago and funnily enuf it was the first time i used the copy all files to floppy and run it from there.
Ever since i reverted to the tried and trusted method of booting into pure dos session (safe mode dos) and just doing it manually, i have never had another failure since.