I am trying to use my optical audio output on my imac to hookup to my AVR 135 Reciever. When I plug in the Optical Audio cable to my imac I see it switch over from internal audio to optical audio out. I then plug the cable into my AVR 135 and run into problems? It does not seem to recognise it as a connected device. I have it plugged into the rear optical 2 port.
Is there something else I have to do to be able to play audio from my computer to the Reciever?