Why won't the audio switch back to my Internal Speakers after having used Apple TV? When I extend my MacBook display to my TV using my Apple TV, both the video and audio work well, being output through my TV.

However, when I disconnect my Apple TV, the video disconnects, but audio from my computer is still output through my TV.

I tried going to System Preferences > Sound and toggling the output back to my Internal Speakers, but this doesn't seem to work.

Any idea why?
I have had something similar on the Answer when directing sound vai the say command to my Apple Tv and then back to the Built in output.

I would have to run the command to switch back twice to get it back

You could open Terminal.app  and type and run 

say -a 38 "I am Back"


a couple of times.