Why does air display no longer work from IMac, with mavericks to apple tv???

Ever since last two updates of Mavericks, I have not been able to broadcast to apple tv as extended or mirroring desktop. It says it is avalable, and does nothing but a black screen on apple tv, and does not even come up as a desktop in display prefrences. What should I do?   IMac:10.9.2

Hello, IamOMan. 
Thank you for visiting Apple Support Communities.
Sometimes a simple power cycle of all devices can resolve this issue.  However, I would recommend taking a look at the section labeled Troubleshooting AirPlay Mirroring in the article below.  Make sure all updates have been processed for the Apple TV and Mac prior to troubleshooting. 
About AirPlay Mirroring in OS X
http://support.apple.com/kb/ht5404
Cheers,
Jason H.

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