No audio when airplaying with iMac

I'm working with a 21.5" iMac (Mid-2011) and after installing Airport Extreme I am not getting any audio sound watching the Youtube video I am playing using appletv out of my TV. Note I am switching to AppleTV. Any suggestions? Please help.

OK, I have my iMac, XBOX, and Blu-Ray DVD wired into my AirPort Extreme. And then I have my Apple TV HDMI'd into my TV. My theatre home system I have an audio optical cable going from the TV to the BDVD. As I stated earlier on my iMac I went into the preferences-sounds and I click the output tab where it shows what is selected and I see that my Headphones is highlighted, when I attempt to select Apple TV it goes back to headphones. I unplugged the headphone jack connected in the back of my iMac but nothing.

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