I just got a 12" Powerbook (512Mb RAM, 80Gb HDD, 1.33Ghz G4, SuperDrive, Airport Extreme, Bluetooth, OS X 10.4) off of craigslist.com. I took it out it's box, plugged it in, turned it on, and downloaded system updates. I then restarted and browsed the internet and watched a movie (Full Metal Jacket). I then put it into sleep mode. I then took it out of sleep mode because I had to do something. Later, I put it back to sleep mode and took it to a friend's house, it will not wake up. I kept pressing the power button and I think I forced it to shut down. I tried resetting the PMU and it doesn't work. It's plugged in right now but it doesn't respond, I can't even get the startup noise, there is no mechanical movement (hard drive spinning). Help!