Last night I turned my Unibody MacBook Pro off as usual, shutting it down completely. The screen went off and so did the pulsing light, showing it was not in sleep. About 2 hours later I woke up to the sound of roaring fans, on what seemed to be like the highest level. I ran to my MBP and found that it was ridiculously hot! There seemed to be no power through it as the screen would not come on but I couldn't turn it off either, so had to resort to taking the battery out. What happened?