I recently had to replace my motherboard. I have WinXP and have tried MANY times to upgrade to SP2, but I will get a brief glimpse of the logo sceen and then it will reboot. I can boot it into Safe mode, but nothing else I've tried seems to work to get it past the logo screen. I also won't be able to upgrade to Vista (if I choose to) because I don't have sp2. Any ideas?????