Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

internal speaker output device missing

Hi,
I can't find a way to get the "internal speaker" option appears in the sound output device list in the system preferences/sound/output, the only option is "digital output".
Because of that, I can only have sound through headphones.
I'm trying to avoid backup and reinstall, it's kind of a pain to reconfigure every things...
So if anybody have an info about that it would be really helpful.
Thanks,
Charles.

Macbook pro 2Ghz 100Gb7200rpm, Mac OS X (10.4.6), firmware updated

Posted on Apr 11, 2006 5:33 PM

Reply
Question marked as Best reply

Posted on Apr 11, 2006 5:54 PM

Do you have a device plugged in the audio jack ?
103 replies

Apr 11, 2006 6:36 PM in response to tribe

Hi,
no I don't have anything plugged in the audio jack, but the digital output (optical output that share the same plug as the audio jack) seems to be activated, in the sense where the red light is enabled if there are no speaker plugged. So maybe desactiving it would help.
Thanks you,
Charles.

Apr 16, 2006 11:06 PM in response to cfc

I've just encountered the same problem (after I've updated the firmware). I've tried to reset the PRAM/PMU but neither fixed the problem. I'm still looking in the groups to see if anybody else has a resolution. The optical light is on, and analog output works, booting the internal speakers work, but only for the initial chime.

May 9, 2006 11:44 AM in response to cfc

I am having the exact same issue.

I can't correlate it with anything in particular I did on the machine. I did do a Window (boot camp) install, but sound was coming out if the internal speakers just fine after that for several days.

I suspect that this is a driver issue.. perhaps the SigmaTel Audio driver on Windows changes some setting which the Mac OS X driver doesn't / can't / won't change back.

The odd thing is that this occurs quite early in the boot process.

May 11, 2006 11:32 PM in response to Philip Lamb

I should point out that audio output on the SAME machine works fine in Windows XP. The Mac startup chime also.

This has to be a bug in the Mac OS X kernel-level audio driver for the SigmaTel audio chip in this machine.. I have filed a bug via ADC (r.4546045) to see if we can stimulate any action on Apple's part.

In order to help identify why only some of us are experiencing this issue, please post here with answers to some of these questions:
* Can you correlate the start of the problem with anything you did on the computer (e.g. install software, etc.)?
* Have you ever booted Windows on the machine?
* Have you updated to MacBook Pro Firmware 1.0.1?
* First 5 digits of your serial number?
* Which MacBook Pro model? (Screen size and CPU speed).

May 21, 2006 5:58 PM in response to hansenonline

But was the digital optical output on (headphone jack emitting a red light) while the speakers were unavailable?

FWIW, I have seen a similar issue to that which you describe (temporary loss of internal speakers, fixed by plugging and unplugging the headphones a few times) but that is a different issue to what we are experiencing here, because in this case, it is as a result of the digital optical output being erroneously enabled.

May 26, 2006 12:30 PM in response to cfc

I just had this exact problem and was able to fix it by inserting headphones back in to the headphone jack a few times until I saw the red light coming from the jack turn off. After it went off I had sound from my speakers again.

Actually I've now been able to reproduce the problem multiple times and have been able to fix it each time by inserting and removing the headphones until the red light turned off. If you look at the tip of your headphones when you put it close to the jack it will glow red if you have this problem. Once you no longer see the red light you'll know it's fixed.

May 28, 2006 10:18 PM in response to Philip Lamb

OK, I took it in to an Apple Authorized Service Provider.

They replaced the left I/O board. Part number 922-7187.
I believe this board has the magsafe power input and the audio circuitry.

The problem is fixed, but I still wonder if it will recurr.. given the odd fact that it only occured in Mac OS X, while Windows XP running on the same machine was unaffected.

internal speaker output device missing

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.