I have a problem with my iBook G4. It is an older iBook 800 Mhz 12" to be exact. When I close the lid it doesn't go to sleep like it is supposed to automatically. I can put it to sleep manually then shut the lid which is fine but I don't always remember to do that and i am wasting battery life. Does anyone have any idea how or even if i can fix this? Is there something in the control panel or is it hardware? Any help is appreciated. Thanks!