This has now happened twice so it's not the biggest problem in the world but I'd like to know if there's a fix or maybe someone has had the same experience. I will close my G4 ibook and the sleep light will not turn on like usual and then I know something is wrong. I will wait just to make sure it's not running to sleep slow and when it doesn't sleep the thing is just off or something. It doesn't respond to anything. I can't turn the power on or off with the power button and can't get any sounds out of it. Have to disconnect the battery and reconnect to get it to work. At that point it's fine and back to normal. I hope it doesn't happen a third time. Any suggestions? Thanks.