Airplay icon has lock next to it & won't allow me to connect to Apple TV
When I tick Apple TV in the AirPlay drop down menu in iTunes it says 'connecting to Apple TV' and then never actually does. I think it's to do with this lock symbol but I don't know how to get it off.
I just successfully mirrored my iphone but can't manage to get there with my Mac.
Help appreciated!
MacBook Pro (17-inch Early 2011), iOS 6.0.2