System Volume Control Doesn't Work

I have two output devices connected to my Mac Mini. I have a set of speakers connected to the jack on the back of the Mac, and a Logitech USB headset connected to a USB port.
When I use the Logitech headset as the audio output device, the volume buttons on my apple wireless keyboard and my apple remote work as the should do, changing the system volume as they are pressed. However, when I change the output device to the built-in output jack, the output volume doesn't change as the volume keys/buttons are pressed. When I press the volume keys/buttons, the little volume icon shows up on the screen and the white dots increase/decrease as you would expect, but the output volume doesn't actually change. You can change the volume using the mouse and the slider, but that defeats the object of having a remote control or dedicated volume buttons. If I switch the output back to the USB headset, everything works normal again. So its only when the built-in output is selected that the volume can't be controlled using the keys/buttons.
Any ideas?
Cheers
Rob

If you have not yet restored to factory defaults I would try that. Maybe there is some corruption which is now in your backup.

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Well...kind of.
Here's an example...
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guh.
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Spacebar.
sigh.
Fine.
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