1 Reply Latest reply: Mar 20, 2014 1:39 PM by dominic23
andrealr17 Level 1 Level 1 (0 points)

MUTE IS STUCK AND WHEN TRY TO CHANGE IT SHOW NO OUTPUT


MacBook Air (11-inch Late 2010), OS X Mountain Lion (10.8)
  • dominic23 Level 7 Level 7 (31,965 points)

    Go step by step and test.

    1. System Preference > Sound > Output > Internal Speakers

        Highlight  Internal Speakers.

        Make sure that Mute is not enabled.

     

    2.Plug in and  remove the headphone.

     

        If you see red light in the headphone port or not, plug the headphone

        in and out of the port 5 or 6 times to flip the microswitch inside.

        Sound output may be stuck in the digital mode.

     

        Try this even if you don’t see the red light.

     

     

    3. Reset PRAM.  http://support.apple.com/kb/PH14222

     

    4. Reset SMC.     http://support.apple.com/kb/HT3964

     

        Choose the method for:

        "Resetting SMC on portables with a battery you should not remove on your own".

    5. Applications > Utilities > Audio MIDI Setup

     

        Audio Devices window

        Side Bar

        Click the Built-in Output.

     

        Under Mute any of the boxes checked? If so, uncheck it.