Sorry for the delayed response.  I had a lightning hit that took out my cable eq, including modem last night. Nothing else just cable equipment.  (I'm a Florida retiree in the Tampa area). As previously noted, manually download and install the Realtek sound.  I posted the link to the drivers in my second response.  
I've lost my audio from any source - YouTube, voice messages, etc. I rarely use audio, so unfortunately there have been several config changes since the last time I used audio. So I can't offer any clues for this issue. One such change was updating from Windows 10 to 11 about two months ago, BTW: The last auto check for Win Update was this morning. With sound level set to max, I used SupportAssist > Troubleshooting > I want to troubleshoot my PC > I want to check a specific piece of hardware > Audio Devices None of the test sounds were audible. I also scanned the headings of the first 30 posts on this site, looking for "sound" or "audio". There are several posts, but none for "no sound". BTW:  I don't have headphones - so I don't know if headphones are working. I would be grateful for any advice. Thanks
No sound