HT204291 PB Miroring Imac Apple TV

hello
since the update maverick, a copy of TV on mac with apple tv not working, black screen on the TV. everything else works perfectly. I shaped into refined the network, the apple tv, and nothing could be done.
the network is the same and works well.
apple tv is updated.
everything worked perfectly before the recent update of Maverick
Airplay itunes (vidéo, son, photos) : Works
Airplay with ipad and iphone (video, son, mirroring) : Works
Airplay Mirroring Imac : dont Work, black screen in the tv.
Imac 2012
Apple tv 2
Iphone5
Ipad mini
Thank you for your response.
Fred

Welcome to the Apple Community.
Try the following steps, check whether things are working after each step where appropriate, before trying the next.
Check AirPlay is turned on on the Apple TV (turn it off and on if it already is)
Check that both devices are on the same network (Settings > Wifi, on the mobile device and Settings > General > Network, on the Apple TV).
Restart the Apple TV (Settings > General > Restart).
Restart the Apple TV by removing ALL the cables for 30 seconds.
Restart your router. (Also try removing it’s power cord for at least 30 seconds)
Restart your mobile device.

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Hey. thank you for taking time to help me.
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