HD 5850 DX11 causes screen to turn off!

Hello everyone,

Here are the specs of the PC/HTPC I built:

-650W antec earthwatts

-Sapphire 5850 Xtreme 1gb

-4 gb G.Skill 1333mhz (9-9-9-24)

-AMD Athlon IIx435 2.9Ghz (stable 4th core unlocked)

-500gb Caviar black (32 mb cache)

-M4A78LT-M LE motherboard

-Monitor is a 42" Plasma TV (1080p)


This PC runs everything perfectly fine. The computer's core and gfx never go above 40C and 50C respectively. There is a hitch, though. Whenever I try to run any game (for example, Shogun 2 or Dragon Age 2), in DX 11 mode, the screen turns off, and I am incapable of doing anything beyond shutting the computer off via the button on my logitech keyboard. These same games, run in DX 9, work fine. Obviously, I purchased the HD 5850 expecting for DX 11 not to be a problem, so this irks me quite a bit.

Is there anything I can do?

Thank you for your time!
3 answers Last reply
More about 5850 dx11 screen turn
  1. I have to ask a REALLY stupid question, but what operating system are you running?
  2. Wups totally forgot to say! It's Windows 7 Home Premium 64-bit
  3. is your gpu overclocked??

    try reinstalling dx11
    does dx10 work??
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