try this… with the computer plugged in and the lid closed, open the laptop up. wait a few seconds to verify it is doing nothing. unplug the power cord from the laptop. Does your display come on when you do that? - if so i am assuming you recently updated your video card drivers… and that is the problem. it is a software issue. try rolling back to an older driver or deleteing and reinstalling the video card from the machine via device manager.