Hi
Doesn't this imply that the iMac range's Intel intergrated graphics functionality is enabled?
"Apple's own promotional copy notes that the following general Macs support AirPlay Mirroring:
iMac (Mid-2011 or newer)
Mac mini (Mid-2011 or newer)
MacBook Air (Mid-2011 or newer)
MacBook Pro (Early 2011 or newer)
Apple ostensibly only supports AirPlay Mirroring on such a small list of systems because the feature uses Intel's Quick Sync technology provided by Intel HD Graphics 3000 and HD Graphics 4000 "integrated" graphics."
http://www.everymac.com/mac-answers...-airplay-mirroring-compatible-macs-hacks.html
Read about this a couple of months ago, didn't even think about this anymore.