Have you ever seen such a weird problem as this: My friend had a TNT GeForce installed on his machine with newly installed Windows XP. It was tested and worked fine. But when he took it home, his computer kept on restarting and just booted in safe mode. He asked for my help and I looked at the event viewer and there was some error regarding Volume Shadow Copy, which was totally irrelevant to the situation. You guess what was the cause of the problem? You won't believe it: the monitor!!!!!!!!! If we unplugged the monitor XP booted normally, and that monitor worked with another PC just fine. I don't understand why! We ended replacing the VGA card.