well im on a white macbook, and this morning i shut the lid with the battery icon reading something like 20%. when i came back tonight, i opened the lid and the screen would not turn on. it wasn't until i plugged the power cord in that the screen turned on, and it came back from sleep mode. in the short seconds after the screen turned on, i noticed the battery icon said 7%, and suddenly changed to 0%. whats wrong with the battery? also, when i return from sleep, i sometimes hear a weird noise coming from the speakers. it sounds sort of like someone breathing. any ideas?