If not is there always no display, and does an external display work? If so the issue may be the cable, I've got a T400 that I had issue with the cable becoming detached on the monitor side, it happened twice (it just pushes in and is reinforced with tape, and the adhesive on the tape weakens with time leading it to be pulled out, the cable is semi-exposed, you can see part of it if you remove the battery, it is the black ribbon near the center of the laptop), I eventually used some gorilla tape (extra heavy duty duct tape) on it and haven't had an issue with the connector pulling out since.
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