Sergio's Printed Words

WebLog Experience – notes about Digital World

Fixing a MacBook Stuck on Mute

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Não sei como este primeiro artigo me caiu nas mão s e como já vi inúmeras vezes mac users com este problema decidi compartilhar o artigo original e mais algumas outras informações que encontrei sobre o assunto. Segue então o que consegui encontrar:

Solução Proposta 1

Occasionally, my MacBook Pro will get “stuck on mute”1 if I pull the headphones out too quickly. When you try to increase or decrease the volume, you see this:

image of "no audio control" icon in Mac OS

When this happens a red LED shines out of the headphone jack:

image of red LED shining out of the headphone jack of an MBP

With some clever Googling, I found out that what is happening here is that the MacBook is stuck on digital optical out (that is, it thinks you have a fiber-optic line — for high-fidelity output — stuck in the laptop).

The frustrating thing is that when you open the Mac OS Sound preference pane, it simply confirms that it is stuck and won’t let you change it to the normal speakers (called “Internal Speakers”):

image of the Mac OS Sound preference pane stuck on digital out

The articles linked above explain that this appears to be due to some sort of stuck sensor in the headphone jack and that, most of the time, sticking a toothpick or matchstick in the headphone jack (or blowing with compressed air) can get it to reset itself.

However, I found a way to fix it without blowing or sticking anything in your heaphones jack (something you’ll appreciate if you do want to use the thing for optical out!).

Here’s what you do:

  1. Plug your headphones back in.
  2. Play a bit of sound through them (e.g., a song), then stop the sound.
  3. Make sure Preferences is quit.
  4. Launch Preferences and open the Sound pane.
  5. While the Sound pane is open and set to Headphones, pull out the headphone plug from the jack.
  6. It will reset itself to “Internal Speakers” and you are good to go.

My theory is that running the Sound preferences pane fresh does some sort of check on the sensors that clears this up. Others noted that you can launch Garage Band and this same check is performed and that can fix it too (but Garage Band is a seriously lame sound editing tool… I uninstalled it in favor of Amadeus Pro a long time ago).

1 (Technically, this isn’t “mute” as that is just the volume icon with the indicator all they way greyed out whereas this one has the indicator at full audio but the speaker icon greyed out.)

Solução Proposta 2

After a lot of fiddling with no success, I discovered that when I plugged into the sound output with headphones and changed my sound settings to use audio port for sound INPUT, the internal speakers kick in.

Had an old set of bad headphones, cut off the jack, and used that jack plugged in, with the INPUT setting, and get speakers to work.

When I want to go to external speakers or headphones, I switch to OUTPUT setting, remove jack, and insert headphones etc. Or buy a jack at Radio Shack for a few bucks if you have no defective phones laying around… a workaround that works.

Solução Proposta 3

If your MacBook Pro got “confused” and I could not turn the speakers on. I used a “System Management Control Reset” or “SMC Reset” to fix it.
This will work on Macs as far back as 2005.

Here is the procedure:

Shut down the computer. Make sure the power supply is plugged in (If a MacBook or MacBook Pro).
Hold down the keys “Shift+Control+Option+Power” at the same time for 10 seconds.
If done correctly, the computer does not power on at this time and stays dark.

Next, hit the power key to turn and the computer, and immediately
reset the PRAM by holding down the keys “Option+Command+P+R”
and continue to hold them done until you hear the startup chime a second time.
Then release the keys.

The system should be back to normal now.

Solução Proposta 4

OK, LAST CHANCE!  Try the following:
1) Plug earphone in
2) play movie, sound should be coming from earphones
3) while playing movie, set sound to mute by pressing keyboard mute
4) open pref > sound > output
5) Unplug earphone
6) Unmute
7) the output setting should change immediately and sound should becoming from speaker

Boa sorte a todos.

Anúncios

Written by sergiovds

julho 8, 2012 às 16:22

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