Just had a bit of a scare...... Had my macbook pro in my room playing music running off the battery and suddenly the screen went VERY dark. When I adjusted the brightness nothing happened, I could just about make out the screen but not enough to do anything. Restared the laptop, still exactly the same. Was thinking that the feckin LED had gone in the screen, godddd. Plugged the charger in, shut it down, closed the screen, opened it, ON, now it's perfectly fine. What the hell could have happened??