I tried many many things.
Solution that finally worked for me (don't skip any steps):
- Open device manager and Uninstall High Definition Audio Controller.
- Shut down (not restart).
- Unplug the power cable.
- Press and hold down the power button for 60 seconds.
- Plugin and turn on the laptop.
I had been at it for the past 24 hours. This is the only thing that worked.
Many thanks