Hello, I bought a p4p800s to replace my p4g8x board that shorted. I put in my sata drive which had xp pro on it. I had to call MS to get a new install key. I can go to the bios and set the boot order and the drives and save. But, everytime I boot this thing, I have to go back, selects the sata drive, and reset the boot order. Could this simply be a battery prob? I thought the battery was only for the clock. Any ideas? Thanks