I have set my iMac on a 15 minute sleep timer (Through Sys pref). Both the display and the computer are supposed to go to sleep after 15 minutes. However, strangely, the display will sleep, but the computer will not. I would prefer not to have to manually ask my computer to sleep every time that I want it asleep, but that is currently the only thing I am able to do. Has anyone else had this problem? Does anyone know of a fix? It may be important to note that I've had my iMac for a year and did not have this problem before I switched to panther.