Problem:
Every couple of months computer won't boot (but I shut down several times a week), gives 2 beep message signifying that a graphics card can't be found. At first I worked around this problem by simply turning off all power, removing the graphics card, and replacing it exactly the same way. It would then boot fine. This has happened 2-3 times in the year I've had it.
Then yesterday I had a crash while I was playing a video game. When I tried my cheap work around it still wouldn't boot. In desperation I tried putting the graphics card in the card 2 slot and it worked, but I had to re-install the drivers.
Just crashed again while watching a youtube video. This time, however, it booted fine.
All graphics card drivers are up to date.
Rig:
Intel DP67BGB3
EVGA GeForce GTX 570
Corsair Vengeance 8GB 1600 MHz
i5 2500k 3.3 GHz
OCZ 128GB Vertex 4