On my motherboard, when I press the numpad delete (.) it brings up the setup, might be the same way with yours.
Anyway, its probably got something to do with the RAID problem... RAID setups use hard drive space for some reason or other on making it go faster(I don't have much experience with them and I'm not even going to try explaining it), so it might be trying to use hard drive space it doesn't have... So, if its trying to detect RAID and it never did before, you'll most likely have to turn it off manually. The only reason I'd see why it would detect for RAID though, if it hasn't before, is if you got a new motherboard...