MacBook sound adjustment not permitted

My MacBook won't permit any sound adjustments.
when I use the sound keys, I get a not permitted sign under the icon for sound.
It is a circle with a line thruogh it.
I also have a red light coming out of the headphone jack.
I have tried a blast of keyboard cleaner into the headphone port.
Help! Thanx.

This is chris76gc.
Thank you Dave Stowe.
It took a couple of tries and different headphones, but it worked.
I'm in Philly, Lake Dallas sounds nice this time of year.
Thanks again, Chris.

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