Mac Book Pro volume only works through headphones

My volume does not work when I do not have headphones plugged into the phone jack? When I try to turn the volume up on my Mac Book Pro, the volume box has a restricted sign below the volume icon. How can I fix this for my Mac Book Pro?
Thank you

Try a NVRAM reset:
https://support.apple.com/en-us/HT204063
Ciao.

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