I think, that you should do SMC Restart first:
# Shut down the '''Mac''' and connect it to your MagSafe adapter and a wall outlet as usual.
# Hold down the Shift+Control+Option+Power button at the same time for a few seconds.
# Release all keys at the same time, then boot the '''Mac''' as usual.
If that does not work, you could replace the screen. ( I have not heard, that you can open up the screen anymore )
Link:
[guide|27657]