When I startup, the sound is automatically mute, When I startup, the sound is automatically mute

I have the latest version of OS X, but since I upgraded, when I start-up my computer, the sound is automatically muted and I don’t know why.  Any ideas? Thank you.

Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time.
Reset NVRAM/PRAM

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