Computer was fine, it was sleeping, took it home from school, sat it down, went to turn it on, noticed the sleep led wasnt on, trying turning the computer on, wouldnt start after a few tries it finally turned on, i heard the fan start, then the drive....then it shuts off, what is wrong? ive tried a pmu reset not sure if i did it right though, the battery and the ac are good, it has been charged recently. any help is appreciated. Its a 12" g4 1.33 ghz