My friend has a 15" G4 Laptop and it's a little more than a year old. Today he tried plugging it into the charger and the charging light is pulsing. I can't get his computer to start unless I hold the power button down for a good 15 seconds or so. Then everything boots up and it gets to the screen where it asks for the password. Before I can enter the password, the screen goes black and won't respond. If I try pressing the power button the screen comes back up asking if I want to shut down, sleep, etc. After pressing Cancel the screen goes black again. If I put my ear to the keyboard I can hear a sort of alarm sound, very faint. The sound is in rhytm of the pulsing light. so my question is? 1) Is it a battery problem or hard drive problem? 2) Anyone have any tips on how to resolve this? 3) Called the support from the store where it was bought and they hadn't a clue.