Sound not on

[SonDan]

Went to listen to a YouTube video and there was no sound. Went to settings - sound -volume .... Turned it all the way up but the speaker icon is still crossed out and turning up the volume rocker still produces no sound. Please help.

Thanks for reading.

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[B. Diddy]

Is YouTube the only thing not making sound? Is it only that one video, or all videos? How about other apps?