Tried everything I could read. Finally remembered a trick I picked up during a conversati... 显示全部 »
Tried everything I could read. Finally remembered a trick I picked up during a conversation with Apple Store in my town: restart in recovery mode with this key combination: Cmnd-R-P: hold these keys till apple logo appears. Then a utility window will open, you do not have to take action there, just quit utility and restart.
Little things like sounds will (should) be repaired. In my case it worked.
Hope this helps those who are still looking for a way.