hi im having a problem with current rig. i have been getting random black screens for a few seconds playing guild wars 2. they usually are only a second. but sometimes it comes back and i can always hear the music and see the mouse but the game isnt there. i have to ctl, alt, del and the program says not responding. just today i was playing assassins creed revalations and it happeded there too. within ten mins of each other the screen went black, came back on, all is fine. then the game froze, crashed to desktop and said the game has stopped working. i have done all basic diagnostics, temps for cpu never goes about 40 degrees, gpu never goes above 60 degrees. i have latest beta drivers ( i updated from the most recent full release to try to fix it). i have plenty of power (650 watt), its a fairly new install of windows.