My Apple TV will not mirror my iMac screen after upgrading to Yosemite?

Ok, I can stream music and movies from my iTunes library. However, My apple tv will not mirror my iMac screen. When I turn on the Airplay Display, my television screen goes blank. I bought the apple TV maybe 5 months ago, so it's a relatively new version.
What do I need to do to get my mirroring to work, please. Anyone? BTW, this is crap. I expect better from Apple.

Hi,
same here. Only Audio no picture ore sharing desktop.
MACOSX: 10.9.5 Operating language German
Apple TV 3: OS 6.2
Here is the fix:
1. Open Terminal in /Applications/Utilities.
2. Run these commands respectively:
sudo rm -rf /System/Library/Extensions/APExtFramebuffer.kext
sudo rm -rf /System/Library/Extensions/AirParrotDriver.kext
sudo rm -rf /Library/Extensions/APExtFramebuffer.kext
sudo rm -rf /Library/Extensions/AirParrotDriver.kext
This will uninstall kernel extensions related to AirParrot. Other solutions around the web being posted are missing the extensions within /Library/Extensions.
3. Enter your administrative password when prompted.
4. Restart your computer.

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My Apple TV will not mirror my iMac screen after upgrading to Yosemite?

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