ah, thats good to see this thread....i have the same prob on one of my pcs, but didnt know for sure what it was, i had but it down to damaged ide port, but it makes more sense that its the bios. my psu kinda went zap, and fried itself, and the video card, so after replacing those and about 50 bucks later it was running again, but i only got about 3 days use out of it, cause then it did this. ah well at least im nearly certain of what it is now, cheers fellas. :)