Sound no longer works on my Apple TV

I have my Apple TV connected to my Yamaha receiver through the optical port. It was working fine until yesterday, when the audio suddenly stopped working. I've checked the connections, and I don't remember changing any settings.

The display on my receiver still indicates that I have a digital audio connection, but there is no sound.

I also tried my DVD player to confirm that it wasn't the receiver, and the audio on that works fine.
 
sad I’m frustrated
Inappropriate?
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