I would be using my pc and put it to sleep or have it go to sleep itself. I leave to go somewhere, come back and hit the mouse. It wakes up from sleep how it normally would but nothing displays on screen. I then hear the fans change speed and the beep when you first start the pc and it restarts. When I go back into windows it said it recovered from an unexpected shutdown and says it was a bsod even though it didn't display. This happened about 3 times and then today I started playing Saints Row 4. As soon as the game started the screen froze and then restarted like it did before. I think it may be caused by the gpu as the bsod doesn't display and the screen just freezes, but it may also be the psu or something else.
Specs:
Intel Core 2 Quad Q6600 2.4 Ghz
Xfx Nforce 780i sli
3x2 gb ddr2 ram @ 800 MHz
NVIDIA Geforce GTX 470
500 gb hdd 7200 rpm
300 gb hdd 7200 rpm
1010 watt psu
Specs:
Intel Core 2 Quad Q6600 2.4 Ghz
Xfx Nforce 780i sli
3x2 gb ddr2 ram @ 800 MHz
NVIDIA Geforce GTX 470
500 gb hdd 7200 rpm
300 gb hdd 7200 rpm
1010 watt psu