I have the same thing going on. Started after I cleaned out my PC and video card of dust. Seems possible that the video card is dead -- personally gonna try swapping out for my old one and see if that helps.
Really hope this isn't the case, but looking at other threads online where fixing drivers/RAM/other things hasn't fixed the issue, it seems likely that either the PCI-e port or video card is dead.
It says solved above, but that link doesn't lead anywhere and I don't see a solution here.
Sorry about that, i posted it as solved to close the thread.
I have since found a solution to my issue, that is to replace my motherboard, i have done this and all is running great
I don't know exactly what was wrong but i tried different graphics cards in different pci-e slots and all to no avail so i tried a different motherboard and it worked. Hope this helps.