No audio, MAC coreaudiod not running

Just an update to the previous discussion: https://discussions.apple.com/thread/8465706

The problem: The audio does not play back. Pressing the volume button (up and down) gives me the stop sign. It's the same with the earphone.

I tried update to Mojave. The problem remains.

I tried plug and unplug the earphone several times, but the problem remains.

I tried using the command in another discussion to relaunch coreaudiod:(https://apple.stackexchange.com/questions/187983/sudo-killall-coreaudiod-made-it-so-i-dont-have-any-volume-at-all)

sudo launchctl stop com.apple.audio.coreaudiod && sudo launchctl start com.apple.audio.coreaudiod

It did not work.

The solution: The audio works again after I shut down the PC, restart in the Safe Mode, shut down the PC, and restart again in normal mode. I bumped into this solution by accident.