My friends powerbook, a 15" aluminum, won't start. He installed virtual pc yesterday and today it won't work. During installation it went into sleep mode, he woke it up, it finished installing, he closed the lid, and it worked for an hour. today it won't turn on at all. the fan runs, the sleep button light is on, and there is a blank screen. any suggestions!?!?!?!?1 thanks, r.