My iBook (12 inch, two months old) has suddenly stopped going to sleep on its own when it reaches the set inactivity time point. it goes to sleep if i close the iBook itself, but not if i just let it go. the display goes to sleep, but the system itself does not. any suggestions? Edit: I think I may have spotted something amiss: the temperature seems stuck at 113, and that makes me suspect there's a program running in the background somewhere, even though everything seems closed down. also: this is only on battery, so something really seems odd. same results for the adapter, but it seems odd to have this much heat with no visible programs running while on battery.