I have a 2010 MP and have set it to put itself to sleep after 30min. Whatever I do it just doesn't sleep. If I manually put it to sleep by going >sleep then it sleeps fine until I wake it. Same if I push the power button. It just doesn't sleep automatically. I have tried it with all applications closed except Finder, this make no difference. I didn't have any problems with my iMac, just with the Mac Pro. Any ideas anyone??