HT204291 Macbook AirPlay do not detect apple TV

I have done all I can. And all other machines, inclusive a PC to which I installed AirParrot finds and interact with apple TV. But my MacBook Air, with AirPlay and also AirParrot do not find the apple TV. What can I do?
The picture is in Norwegian, but I guess everybody can see the clear image. "No units found"

So this is what works:
iPad 2
iPhone 4s
PC with windows 7 and AirParrot
Directly with the ATV and remote
Only my computer, which I cannot just re-install, because I setup the computers when I buy them with TimeMachine.
The friendly guy in the genius bar told me that a new-installation from TimeMachine would not fix the problem if there is a bug.
I really do not know what I can do? Do anyone know a airplay fix?
I thought apple tv is a great solution for doing presentations. But I would like not to run the presentations from the iPad

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