September 27, at 7: Choose sound card for audio output in system preferences, which will be by FireWire or thunderbolt depending on which you used. I have the correct input and the cables are fine…could this be an OS X update issue? August 8, at 9: I did it successfully before the upgrade. I can still switch my port to Apple TV with no issues with video or audio but when I return to mac mini, my screen is still black.
I have had my Mac Air hooked and working and suddenly now it wont work when I attach it to my tv.
How to Hook a Up a MacBook Pro to an iMac