Sound not working after using AppleTV

I used AppleTV the other day with my MacBook Pro and everything worked find while I was using it. However, I want to watch something on my laptop now, and my sound is not working. The volume is grayed out in the menu and whenever I try to use my volume buttons to turn it back on, nothing happens. I think my laptop still thinks it is connected to AirPlay, but it isn't. And even when I would disconnect from AirPlay but keep AppleTV on, the volume was still grayed out. Please let me know if there is a way to fix this, as I find my self unable to.

Hello there, alligabor.
The following Knowledge Base article provides a great resource for information and troubleshooting of AirPlay Mirroring on OS X:
About AirPlay Mirroring in OS X
http://support.apple.com/kb/ht5404
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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