Hi I am a new forum user and also a bit of a rookie on the Pc I recently bought a new Dell xps 420 w/vista home premium 64bit desktop and I have been getting an occasional problem with a pixelated screen it covers the whole screen with black and white and red squares and the only way I can get out of the problem is shutdown manually as I cant even see the start screen to get to the shutdown or restart can anyone give me any help thanks, DANNY B.