This is weird, I recently upgraded from a radeon x800 to an nvidia 8600gt. Now, seemingly more often I will be in the middle of a game and all the sudden the monitor will simply go blank. I can still hear the game running in the background, and sometimes it will kick back on, but go black again. I know it's not completely losing connection because my monitor doesn't show anything. Usually it flashes dvi/analog. I've also been having a problem with the computer just completly shutting down, sometimes with a blue screen of death flashing by as it does. This sounded like overheating to me, or perhaps my external drive (which I had been running the game off) going bad. Let me know if you have any ideas OT, thanks!