456      iPhone_iPad_Mac_apple

no sound on macbook air

one day the audio from the internal speakers just quit. Anyone know a solution for this?

Hopefully one of these steps should solve the problem.

1. System Preference > Sound > Output > Internal Speakers

    Make sure Mute is not enabled.

2. Remove the headphone.

    If you see red light in the headphone port, 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.

3. Reset PRAM.  https://support.apple.com/kb/PH4405

4. Reset SMC.     https://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.app

    Audio Devices window

    Side Bar

    Click the Built-in Output.

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

Best.

Thank you, appreciate your help but have tried every one of your suggestions and still nothing.  Sound preference is grayed out - can't uncheck mute and neither input nor output shows up at all. Audio MIDI shows no audio devices. Don't have the red light and have never hooked up external audio devices or headphones. Reset PRAM and SMC. Nothing. Thanks anyway.

My audio and facetime camera just stopped working after I installed the latest security update earlier today. Nothing i have done is making them work again.

I got a tip from a colleague to install the 10.8.3 combo update (versus the app store one) and it fixed everything :-) https://support.apple.com/kb/DL1640

Thanks, the "Reset PRAM" part solved my problem! Very grateful for your help!

Thanks dominic23, resetting PRAM not only solved my audio problem but also solved my browsing problem too.

Thanks so much - resetting PRAM did the trick.

My Macbook Air has been without sound for a few weeks. It's only a couple of months old. At first the sound problem was intermittent and then restarts stopped working. Before resetting the PRAM and SMC I checkout Applications > Utilities > Audio Midi Setup per Dominic23's suggestion. His directions were:

     Audio Devices window

     Side Bar

    Click the Built-in Output.

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

None of my boxes were checked, however, I clicked the gear button at the bottom of the sidebar and clicked "Use this device for sound output" and the sound came on immediately.

This was super annoying. Thank you Dominic23 for pointing me in the right direction.

I had the same problem but when I restarted my macbook air, the sound started to work again! Maybe all you have to do is just restart your device!

I had the same problem and resetting the PRAM worked great.. Thank you so much ;o)

I was super frustrated. But all I had to do to fix my sound was go to: System Preferences/sound/output and then select a device for sound output.  Then I selected internal speakers.  Then my sound worked again.  I think after I used my headphones it deslected my sound settings. 

Hope this helps others.

Thanks. Resetting the PRAM solved it

Reset of PRAM worked.

tried to replace a known-good i/o board.

最後更新：2017-08-31 21:43:43

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