I upgraded my Yosemite to Sierra so I could run the new Logic Pro X, which I purchased and installed after the upgrade. I now have no sound out of my headphone port. HDMI works fine. Most of the fixes I read state that I need to select internal speaker, then reselect headphone port, however I have no internal speaker option.
This happened when I upped from El Capitan to Yosemite, but I had the internal speaker option then. Now it's not on the menu. Dead in the water until I can figure this out, can't run sound to my monitors otherwise.
Mac OS Sierra 10.12.3 (16D32)
Mac Mini (mid 2010)
2.4GHz intel core 2 duo
8 GB 1067 MHz DDR3
This happened when I upped from El Capitan to Yosemite, but I had the internal speaker option then. Now it's not on the menu. Dead in the water until I can figure this out, can't run sound to my monitors otherwise.
Mac OS Sierra 10.12.3 (16D32)
Mac Mini (mid 2010)
2.4GHz intel core 2 duo
8 GB 1067 MHz DDR3