Airport mirroring not working on i7 Mountain Lion

Hi all,
I've trying to make use of Airport Mirroring on my i7 27" iMac with my Apple TV2. I can play video and audio from iTunes (or from Apple TV) so the devices are clearly connected OK on my wireless network. 
But no matter what I do I can't get airport mirroring to work. I've gone into Settings, Display and ticked the check box for Show Mirroring in the Menu Bar where available" but I don't get any airport icon in my taskbar.
Any ideas?
Thanks,
Rob

Hi,
Airport Mirroring is using Apple TV to display what is on your iMac screen onto an Apple TV connected TV screen. It should also work for audio ie play the audio through my AV system.
I can get this functionality to work using a third party app - I've downloaded the trial version of AirParrot - but this should work in Mountain Lion and doesn't on my i7 iMac!
Thanks,
Rob

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