Okay, that is good to know, has the cable been unplugged recently, either on purpose or by accident. I ask because its possible the pins aren't making complete contact, this happens if a pin gets damaged from incorrect insertion or even if it was dropped and hit something the wrong way. Is it possible to test with another cable? Hardware wise the next thing to fail is the on board video or the monitor itself. Can the screen be tested on another device, and the computer with another screen? Then there's software, you've already tried a system restore, the next thing would be remove the current drivers and reinstall.