There are many YouTube users who face a common problem of no sound or audio when playing videos on YouTube. If you are also one of them then don't worry about checking your system sound settings and these simple solutions can help you to fix this issue.
1. Check YouTube Volume/Mute Button
2. Use a Different Browser
3. Restart your Computer or Phone
4. Check your Sound Card and Speakers on the Phone
5. Update the Sound card Driver
6. Check your System Sound
See also - https://onlinegeeks.net/youtube-not-working-how-to-fix/
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