Run out of ideas why I have no sound

Obviously sound is routed to HDMI.
To force it to the analog output (the headphone jack on the Pi) run
'sudo raspi-config' and select the audio config option in the advanced menu.
See https://www.raspberrypi.org/documentation/configuration/audio-config.md for details.
You can also use this command directly in a terminal:
amixer cset numid=3 1
Raspi-config uses the same command behind the scenes.
Hope this helps.