Mac Mini (Intel) - No audio via digital optical

My audio was working fine previously with a standard stereo cable, but today I've tried switching to an optical cable and the sound no longer works. If I watch the Sound preference pane as I connect and disconnect the optical cable, I can see it switching between Headphones (old/stereo cable) and Digital output. Based on some other threads I've found on this subject I've also tried launching Audio MIDI Setup, and in the output section it just has the message "Output is not supported".
Has anyone come across this issue?
For reference it's a 1.83ghz Intel Mac Mini running Leopard 10.5.2.
Thanks,
Tom

I'm reasonably certain it's not the Pioneer as I have other digital components (1 optical, 2 coaxial) connected to it and working perfectly. I'm also fairly comfortable that the plug is activating digital as I can see it change in the preference pane when I insert the plug (removing it goes back to internal, and inserting the stereo cable switches to Headphones).
I'm concerned by the fact that no light is visible from the port, even when the optical mini adapter is inserted by itself (without the toslink plugged into it). On the Macbook Pro red light was always visible when the port was active, as it is on other components I have. Can anyone confirm if you can see the light emitting from yours?

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