My minimac was running fine. I had output from earphone jack going into my pc speakers. All outputs fine. I bought a Komplete audio 6 and was using that for a while for inputs and outputs and it worked fine. A week later I disconnected the Komplete audio 6 since I wasn't doing any recording and started garageband to "play" , not record, and get "no core audio detected." A youtube video will play fine through the speakers connected to the earphone jack, but garageband "won't recognize core audio" so is silent. I tried setting preferences but I don't even see core audio listed. Anybody know whats going on?