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I don't see any R7 850 card listed. If you meant HD 7850 get the drivers here.
Try uninstalling the drivers from programs, then in safe mode run DDU driver cleaner. Then re install the drivers.
Unfortunately, that doesn't work. I tried to boot with Linux and, after some loading, it goes black, just like in Windows.
I think more and more that the problem is VRAM related :/
I like the DDU tip, tho Thanks for the reply.
It sounds like you had a hardware failure on the card.
Could try running something like the Distributed.net client on it (doesn't use much VRAM at all) to try to isloate the issue - but if the card had part of it die, probably a waste of time.