Apple TV and AirPlay/home sharing
Why won't my Apple TV recognize any of my devices? Home sharing is turned on and they're all on the same wifi network...also, how do I know if I have a 1st 2nd or 3rd gen Apple TV?
Apple TV, iOS 5.1.1
If you have the 3rd Gen Apple TV here is some troubleshotting options.
http://manuals.info.apple.com/en_US/apple_tv_3rd_gen_setup.pdf