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Macbook No sound, red light

Sometimes when reboot my macbook pro, I have no sound and optical turns red light on.

 

optical-rednosound

So I found a good advice by Michael Bransome

Then I tried this: opened Sound prefs, went to the pane for device for sound output, stuck the headphone jack in, at which the device name changed to headphone, then I clicked on the line showing headphone, but I *held the mouse button down*, and while holding it down removed the jack. This made the device name change to internal speaker, and it worked again…

system-sound-prefs

I was everytime angry this save my day 🙂

 

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