Help - speakers suddenly stopped working

Hi,
I was playing a CD in iTunes today, at first I was listening with the internal speakers, then plugged in some external speakers (I did not stop the CD playing), and powered them on. When the CD came to the end I unplugged the external speakers. Since then I've not been getting any sound from my eMac's (800MHz w/ superdrive, OS 10.2.8) internal speakers - they've always worked well up until now. Sound is coming through fine on headphones and the external speakers.
I noticed that I had not switched off the power to the external speakers before I unplugged them, could this have caused some problem?
I've checked the sound preferences for 'Output' and it says 'Built-in Audio Controller' - there's no other option when headphones/external speakers are unplugged.
I've restarted the machine - just in case - but no joy.
Could this be a driver or firmware (or whatever it's called) problem? It seems strange that both left and right have gone at the same time, and that there's no noise/hiss coming from them, just silence.
Any help would be most welcome.
Cheers,
Tracy

Well, I still don't know what the problem was, but when I switched the eMac on today the internal speakers are working again.
If anyone does know a reason, I would be interested to know in case its something I need to fix now, rather than leaving it to fester.
Cheers, Tracy

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Speakers suddenly stopped working

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William, welcome to the forum.
Have you checked in "Control Panel / Sound" to assure that your sound device is selected as the default? I have had this happen to me many times over the years; especially, if I have made changes of any kind to my computer.
Please click the "Thumbs Up+ button" if I have helped you and click "Accept as Solution" if your problem is solved.
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