Thank you. As I assume, is the HDMI audio not working?
Remove the Display driver and the Audio driver:
Remove the Display drivers completely and Install the newest copy of the driver, available from the OEM or the GPU maker. The steps for it are here:
https://www.yourwindowsguide.com/2022/02/troubl...
Eventually, after Windows restarts, check for Windows updates, or download the display driver from the computer manufacturer:
https://ftp.hp.com/pub/softpaq/sp141501-142000/...
2nd, same steps for the Realtek Audio driver
Remove the driver completely from Sound Video and Game controllers > Realtek.
https://answers.microsoft.com/en-us/windows/for...
Realtek Audio link:
https://ftp.hp.com/pub/softpaq/sp148001-148500/...
After the installation, see if your issue is resolved.
Disclaimer:
The links include a non-Microsoft website that would provide accurate and safe information. There is no need to buy paid products to fix your computers as they sometimes do more harm than good.