Hello everyone. I have run into an odd problem. My fairly new iMac 24" from last June has trouble going to sleep using the settings in Energy Saver preferences. I have recently reinstalled OS X and nothing was wrong with sleep before the reinstall, as far as I remember. I have the settings set to default right now and the iMac just won't go to sleep. I have reset PRAM and unplugging all cables overnight(I heard that it does something wonderful to the computer) But I can't remember if it resets something or what. My open apps are the usual suspects like Safari, Adium, iTunes and Mailplane - I do have a lot of background apps running; Logitech Control Center, FinderPop, Growl, iStat menus, Antipop(for getting ridding of speaker pops whilst the system sound is idle) - I can't quite pinpoint the thing that stops my iMac from sleeping on its own. I can force sleep it just fine and it won't wake up all the sudden. What can I try to get it to sleep - is it a PMU reset that I need to do? If so, does anyone here from the top of their head remember the trick to do this on an Intel machine? Is it something like unplugging all cables and then only insert the powercable while holding the powerbutton on the back of the computer for a second then letting go? Thanks for any help.