Have the most up-to-date driver for the graphics card, running windows 7. When in a graphics application running video in a window in a browser or working in photoshop cs5, the screen will go black flash a bit and then the window in which the graphic was located (photoshop or a browser window playing a video) will be blank (white or green). I must restart the application or windows to have it come back. Don't know what else to try.