I have recently purchased a "custom" pc from a company and have had it for about a week and have had issues with the audio as when I have it connected VIA hdmi it provides picture but no audio. It won't even show up under sounds with disabled/disconnected selected. However the onboard audio works just fine while looking under device manager the tab "Audio input and output" is not there and the AMD HDMI audio driver does not show up.
Apologies if kind of confusing or wrong section as don't know which category to place this under. Will provide any information that would be needed.