Problems with video cutting off suddenly. The screen goes black (blue, actually), then flashes the 'No Signal!' message for a few seconds, then the monitor shuts itself off (due to no signal). To recover I have to manually power the machine off and on.
I'm not playing games or doing anything graphics-intensive, or anything-intensive.
About half the time there are symptoms just before it happens - either the graphics slow down, for example it takes a long time to drag a window across the screen, or there's a slight hang after moving the mouse, then poof the video is gone.
Problem occurs about 90% of the time. Sometimes it happens immediately, on the first mouse move after Windows loads, other times it goes 10 or 20 minutes before crashing. About 10% of the time the problem does not occur.
This is an XP machine, generic PC clone about 5 yrs old. There are no events logged for these crashes. Device Mgr lists the display adapter as Radeon 7000. Sticker on video card says RV6D-B3-64M. When I google that I find "PowerColor ATI Radeon 7000 64MB DDR AGP" with pictures of green cards, but my card is red ...