13" MBP won't turn on since I accidentally plugged it into the Loudspeaker output on a mixer instead of the mono output. When I go to turn it on I can hear the fan start and the white light on the front turns on. However the screen stays black, and the keyboard doesn't turn on (Caps lock light doesn't turn on when pressed). I'm fearing a major problem, and don't currently have AppleCare, so any advice would be much appreciated. Thanks, Eamon.