I came home from yesterday from work and went to use my powerbook and the first thing I saw that was wierd was the battery was dead after it had been plugged in to the socket. I fixed that by switching which socket the power adapter was plugged in to. After my powerbook was powered, I then started it up and found that no sound at all was comming out. I checked if it was some how muted, and it wasn't. I've looked in all the control panels and did a search on Apple support, but it doesn't seem that anyone else had this problem. Help!