My volume won't work on mac pro

My volume won't work on my Macbook Pro. The button works and I can see the volume being turned up/down, but no sound comes out! I tried everything in the volume section of System Preferences. Does anybody know what I can do? Thanks!

Try a PRAM reset:
If no success, look in the audio output port. If there is a red light, the internal switch is stuck. Insert the headphione jack a few times and see if that will trip the switch.
Ciao.

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Anniefb1 wrote:
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