The other night I woke up in the night, got up, saw my laptop sitting on the desk. The screen appeared to be on which was not right because I had it set to turn the screen off after a few minutes of inactivity (always change the setting before night, better than closing the lid and causing heat buildup) and I'd clearly seen it turn off before I'd gone to bed. I go up to it, and the backlight is on but there is no picture. Moved the mouse, pressed keys, and the system was clearly locked up with the backlight on but nothing showing. When I restarted Windows XP gave me that "Your system has recovered from a serious error. Click here for more information" dialog box. It's only happened once so far, but that worries me because it seems at least slightly videocard related.