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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