Hello , sorry about your problems. My name is Marco and I will do my best to help you.
Outdated or corrupted audio drivers can cause HDMI audio issues. Try updating your audio drivers through Device Manager or your PC manufacturer's website.
To do this, right-click on the start button and select "Device Manager".
In Device Manager, expand Sound, video and game controllers.
Right-click on the audio card you want to update and select Update driver.
If that doesn't change anything, right-click and select "uninstall". Restart the computer so Windows will reinstall the drivers automatically.
Run the Windows audio troubleshooter. Select Start > Settings > System > Sound > Troubleshoot common sound problems and select Output devices and/or Input devices.