I am now very leery of BFG vid cards. Their overclocked 6800 GT caused me intermittent boot problems (boot failures) which, over 6 months, grew so bad that the machines won't start at all. I wrote to BFG, and they admitted that their cards are known to cause this problem on some computers. They also admitted that they didn't know what was causing the problem, and that I was stuck with it til they figured it out. Not bloody likely.
The machines have been returned for credit, and I am now awaiting a third from a different manufacturer with a different vid. card maker. Incidentally, the machines had different motherboards. Both had ABIT AMD 64, one with the VIA and one with nVidea NForce chip, so it wasn't a motherboard problem as I originally had thought.
Anyhoo.. if you get intermittent boot failures that increase in frequency, troubleshoot the BFG vid card first (or get one from another manufacturer to begin with).
eh?