Why is my head phone jack red on my headphone jack

why is the head phoen jack on my mac bookpro have a red lignt in it and the sound olny works when i use my headphones

Because the internal switch is stuck.  Insert your headphone jack a few times and see if that will trip the switch. If no success, try a toothpick and jiggle it inside.  If still no success, The Apple store genius bar and have the technician do it.
ciao.

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