Hello, I'm experiencing very annoying sleep/wakeup problems with Mid 2007 iMac. I think it started after 10.5.6 update. 1. iMac does not go to sleep according to the Energy saving settings, this was actually from the day one. It goes to screen saver, display sleep, but not complete sleep. 2. Since automatic sleeping doe not work, I put it to sleep manually by pressing Power button. but in this case it sleeps so deep, that it does not wakeup. The only way to bring it back is to hold the Power button to complete OFF and then power back UP. I tried, PRAM and permissions tricks, nothing seem to help. Is there any known solution to this problem? Thank you.