I have MacBook, the speakers seem to stop working. when I press the buttons control the sound, the "menu" is greyed out with a forbidden symbol in premium. If I plug in headphones, the sound and the keys are working normally. In its preferences for the digital output, I have a message "the volume of output is not adjustable on the selected device. Skills in my Mac is very low, I dare not listen to anyone too. There is a red LED in Headphone jack. Pleas help.
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