Oh, you will have much fun at this. I've been trying to figure my computers problems out for months now. Every time I think I have it solved, a few days later the crap begins. Replacing the video card got it to stop going black. Pulling out the old ram got it to quit rebooting itself. Now it just locks up, sometimes it can go days without doing it and some days it locks up a dozen times within mintues of coming back up. When I feel like it I'm going to replace the mobo next.