here are my PC specs:
Intel Pentium Dual Core e5200 (Overclocked to 3.5 GHZ)
4 GB Ram
XFX Radeon HD 7770 Black Edition
My monitor just shuts off only when playing Metro 2033 and Metro Last Light. And there are specific areas too. In metro 2033 the monitor shuts off once I get to the part with Miller where you fight the Watchers in the prologue. In Metro Last Light the monitor shuts off when I get to the part where Artyom and Pavel go up the escalator then the black screen appears all of the sudden. Like the screen turns black in specific areas. I can have my GPU at 80 degrees Celsius in an area where the game just doesn't shut down at all and when in some areas the monitor shuts off even if the GPU has low temp like 55 degrees Celsius. No other game has this problem. Also No matter if I click the mouse, press keys on keyboard or power on and off the monitor, it won't come back on unless I force a reboot on my desktop.