I am waiting for the refreshed iMacs to be released to make the switch from Windows to Mac. I am going to be using my iMac for all sorts of things but one of the main things will be using it as a media server for my multiple ATVs. I would like to know if there is a way to shut the display off but keep the computer on for streaming purposes. I don't want to put additional wear & tear on the display when it's on 24 hours a day for streaming and downloading. As far as I know, there is no button to turn only the display off. Is there an option in OSX or some "app" that allows this?