Fairly recent new build (JULY). Had no problems up until now.
I was playing Mass Effect 3 last night when the screen suddenly went black. The monitor light indicated it was still on, and the my PC's fans were still going. I was sleepy and thought maybe the game had crashed, so switched off my PC and went to sleep.
Woke up this morning, switched it on. It came up to the bright blue windows 7 screen and shortly went black. Reset and tried again. No change.
Had a look at the connections to the card (HDMI, PSU cables) and everything was secure. Re-seated the card and still had the same problem.
The display works in safe mode, but I couldn't find anything indicating a problem. Uninstalled and re-installed the drivers. I even went through a system recovery, despite thinking it'd be pointless.