Audio adjustable only in sound system preference

On my 2 years old Macbook Pro 17" since last week my sound volume only is adjustable by adjusting them in Sound System preferences,
The slider in my menu bar still shows and my sound buttons on my keyboard still work with 'beeping' sounds, but has no effect to my actual sound volume.
in system preferences everything is still on 'internal speaker' and showing normal levels.
Does anyone know how to get my buttons and my menu bar slider work again on my actual sound volume?

Try a pram reset:
Power off, then power on andbefore the start up chime hold the keys option,command,P,R(no commas)continue to hold these keys till you hear the the chime 2 times, then release.
Reboot.

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malcolm007,
Here is a pin description of the 4 pin connector, there impedence and shunting that needs to be taken into consideration, not to mention the response curve that this is optomized for,ie:headset mic response. There could be potential damaged cause by incorrect matching and shunting (shorting certain pins to ground) you might consider calling Apple and see what their response is. You can even try experimenting at your own risk, I myself can make no recomendation and would advise against it as you could risk damaging your device. I found no data that would allow an informed decision on my part. The audio quality would most likely be sub par for a music type of application anyways, as it is most likey optomized for the headset mic as prviously mentioned.
USB interfaces are cheap and most sound good and will definatly provide a safe and flexible way to get in.
IMHO
http://www.speechrecsolutions.com/assets/iPad_and_microphones.pdf

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never knew about this shortcut. pretty useful. I also have to access this pane very often to switch between sound output devices. this got very annoying and I found this freeware
[Sound Source|http://www.rogueamoeba.com/freebies>
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Hey Jack (woofman jack)
Sounds like the micro switch inside the output jack that switches the audio from internal to external is stuck on external. Try plugging a set of buds, headphones or digital Toslink adapter in and out a few times to see if it will unstick the micro switch. You also might try jiggling a tooth pick around inside the audio output jack to see if that unsticks it? If not then you'll need to make an appointment at your Local Apple Store or Apple Service Provider and have the jack serviced.
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HI,
Locate these files.
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com.apple.loginitems.plist
com.apple.keychainaccess.plist
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Dr. Smoke
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Message was edited by: ArjanM

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Audio adjustable only in sound system preference

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