Has anyone else got a not entirely lit backlit keyboard? I have just bought a refurb'd 15" powerbook and it's all fine except the letter 'A' and number 2 through 0 are not lit in the dark. Weird? As I'd imagine the keys are not individually lit with their own special bulbs?! Surely it's one light shining through all of them...? Just wondered if it was entirely refurb'd!?