iMac + Apple tv + airplay mirroring + black screen.
Hi.
I'm having some problem when i'm trying to do airplay mirroring or airplay extended screen from my imac.
The imac is just 1 year old and the airplay funktion have work before.
When I try to connect I do get audio from the computer to my Apple TV but only a black screen.
If i go in to itunes and play a video from itunes thrue the airplay icon it works.
Ive tried most of the suggestions from this forum but most of them are related to 3pary apps thats not been installed on my imac.
// Mathais
iMac, OS X Yosemite (10.10.3), Apple TV