I am a self-confessed computer moron. Maybe I am asking a dumb question here, so feel free to lambaste me with virtual whips.
Periodically, I watch some YouTube videos. If I watch one, sometimes more than one, all works fine. Suddenly, I click on a song/video I want to watch and all goes silent. That’s it. Game over. Nothing short of switching the computer off is going to bring sound back. Even then, it doesn’t always return. Sometimes I have to switch it off a few times to restore audio.