Since it does flicker and you get different results when you move the screen up/down, my first suggestion would be to look at the Display Panel Cable. I would think that it is either loose, or that it is internally broken and only makes intermittent contact. [http://support.dell.com/support/edocs/systems/xpsM1330/en/sm/display.htm#wp1109848|Here is] the manual, and not a bad job. See if that will help you. Good Luck