I have an older laptop and I think the screen is going on it. When it is turned on, after a few minutes the screen dims to lower than you can set it manually using the function keys. When I say "dimming" I mean it is nearly all-black, but you can sort-of see what is on the screen. Sort of a black-on-black or grey-on-black style. It is not clear enough to use by any means. It occurs at random times, even if you are in the middle of doing something. So I don't think it is a power setting issue. The external monitor works fine. Does this sound like a bad connector, frying video card or dying screen part? It does work with the external monitor so I am wondering if it is destined to be a "portable" desktop?