Line/Optical out and internal speakers?

When a line is inseted into the jack whether it be optical or RCA leads the sound will only be outputted from the jack - obvously.
Is this a software or hardware switch? Is there any way of disabling it allowing sound from both output and internal iMac speakers?

I suppose a speaker with a USB connection will not
override the internal speakers...
Ah, but they do as you must select your output source - in my case I have a 1st generation set of USB Soundsticks and you must select between internal or Soundsticks.
BTW - for those looking for speakers, I would stay away from any USB speakers still out there (although it burns me to do so I might buy a pair of Soundsticks II which use the audio jack... Garageband 3.01 hangs when using the USB Soundsticks unless they're plugged directly into the computer - losing one of the USB 2 ports which HURTS!).

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    Hi, and a Warm Welcome to the Power Mac G5 Forum!
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    The hardware solutions you have already mentioned.
    These may be of interest
    http://macupdate.com/info.php/id/16425
    http://www.versiontracker.com/dyn/moreinfo/macosx/25458
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    Hello,
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    Reset PRAM.   http://support.apple.com/kb/PH18761
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    Use OnyX to clean your system and User cache files. It's free to download. Just click on the "Automation" tab, check the boxes and run it.
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    MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG Podcast
    Creator of 'Mac611 - Mobile Mac Support' (designed exclusively for an iPhone/iPod touch)

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    Follow these instructions for deleting the System Preferences plist:
    https://discussions.apple.com/docs/DOC-4301
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