Hello. I have a late 2012 27" iMac running El Capitan and an Apple TV 3. When the Apple TV 3 is off, I see it listed in the AirPlay menu as a single unit, which it is. I'm unable to turn on the Apple TV from the menu. I have to get the remote and turn it on. When I turn on the Apple TV, I see an additional Apple TV. The second Apple TV (3) eventually disappears and then I'm able to use it as an AirPlay display, to the original Apple TV listed. So...any ideas why this is happening and how to fix it? I is confuzzled.