I have been having this problem for a while now. Sometimes when i am watching videos (especially full screen) or full screen games, the screen starts being distorted and flicker like crazy. If i try to tilt the labtop display, the screen goes into this weird black screen state (it is almost like flickering from black screen to extremely low brightness display). I can still here everything going on in the background. Unplugging the AC Adapter stops the flickering but not the black screen. I sent in my laptop to dell repair and they replaced the motherboard. The laptop worked fine for two days then the problem appeared again. Anyone knows what is causing the problem?