Probably better to watch the video, then read the explanation, it will make more sense: This problem occurs EVERY time I restart the PC, only on the BIOS, when windows starts, its fine (although a few artifacts creep in there too, but closing the page or app gets rid of it). It has happened across 2 different Motherboards and 2 different graphics cards. It only happens on one monitor of my two, and is dissociated with which port is used by which monitor. It also happened on a webpage with the old 8800GTX: Any ideas on how to fix? Note: I already tried reinstalling flash.