Hi, I've had this problem for a year with my old card.
Came brand new and had that odd problem of (for me it was black and white) flickering all over and squares and cubes and then all back then recover to desktop, video driver has recovered.
I spent countless hours researching and finding out what to do. At the time I did not know but it is a 100% hardware issue.
I took the time to increase maximum voltage and run the fan at very high settings. This resulted in less, but still existant crashes.
One day, after a good 2 weeks at NAS JRB Fort Worth learning about some F/A-18C's I came back home to find my card dead. Shit would not start whatsoever.
Turned out the problem was indeed very hardware related and when I got a new card I put in the same drivers I was using before and I have never had it crash since.