Windows 10 Hdmi Audio. Many Windows users have reported this issue. Speaking of HDMI, many Windows users reported various HDMI output problems.
Download the latest drivers for your ATI HDMI Audio to keep your Computer up-to-date. Just recently (for no obvious reason) my laptop stopped recognizing the HDMI cable plugged into it. You pull the plug, reconnect, reinstall drivers etc and experiment with different solutions!
In the past I have been able to find the hdmi audio and enable it, but I have to jump thru so many hoops that I cant recall how I got there, so the next time it happens I repeat the process of seek and find.
Many Windows users have reported this issue.
This issue can be caused by several factors. My monitor properties say it has not been migrated? The problem could be with the computer, the HDMI cable itself, or the monitor or TV you are connecting to.