PC loses vga/dvi connection

[yahan]

When I play BF3 my pc loses all dvi "connections" my screen goes black and then I lose sound. My pc is still running and I actually have to power it down to restart it. My power supply is 'Xtreme Gear PSAZ-CP600 600W ATX12V Power Supply' which runs fine. I just seem to lose all sound and video feed.

 

[The Stealthinator]

When the screen goes black, try unplugging the DVI cable and plugging it in again. When you press Ctrl Alt Del does anything happen? If the menu comes up go to Task Manager and see whether that process has stopped responding.