After adding Apple TV, my itunes multiple speaker icon (airplay?) blocks speaker output on my pc. Local speaker output will not highlight. Any ideas?

Question

After installing Apple TV on another TV, my Itunes on my PC will not output to speakers.  Apple TV added multiple speaker icon but it will not highlight "local computer".  I can check box but volume bar won't open and no sound comes through although speaker mixer shows signal.  Any ideas?

Answer 1

This same thing is happening to me on only my 2011 Macbook Pro. My other macs and iOS devices can all stream audio to my airplay devices (airport express and atv2) just fine.
On my Macbook Pro trying to play to 1 external speaker
Click the airplay button in iTunes (airplay logo lights blue)
Select ATV2 or Airport Express
Airplay logo goes back to gray
No audio is played out of airplay
On my Macbook Pro trying to play to multiple external speakers
Click the airplay button in iTunes
Select "Multiple speakers..."
Check the box next to ATV2 or Airport express
Check box "depresses" like I've clicked it, but the box is never checked
No audio is played out of airplay
Like I said, all of these things work perfectly on all of my other apple devices. It's just this one Macbook Pro that it's failing on. It seemed like it just started failing a month or so ago. It's driving me bonkers!