I am having problems mirroring my iMac Retina through Apple TV.
I am happy that my Apple TV setup is OK as I have no problems with mirroring my 
Macbook Air.  I am also happy that my network is OK as I can watch iTunes 
content on my iMac through the Apple TV.
When I open airplay I appear to have the option to either extend the desktop or 
mirror the display bu clicking on the mirror option has no result.

Any suggestions?

Barry



iMac Retina 5K 27"
Intel Core i5 3.5 GHz 
8       GB RAM
1.0 TB HD
OS X 10.10.2



















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