I'll preface this by saying I am using a Mac for the first time. I'm in the process of trying to rip and encode 600 DVDs. When I go to sleep at night I would like to be able to leave my computer encoding throughout the night. No matter what I do I cannot get my iMac to stay on throughout the night running Handbrake while I put the screen to sleep. I've tried different settings in the energy saving preferences and no matter what I do it ends up shutting itself off 5 minutes after I shut off the screen with the keyboard short cut.