Garageband fails to recognize digital audio in connected for recording

I just bought a new mac mini and when I connect it to my digital piano via the digital (optical) audio in jack, neither Leopard 10.5.1 nor Garageband recognizes that there is a device connected to the audio in port.
The digital piano does self-power the cable (i.e. I can see the red light emitted by the piano signaling that it is the sender). I've also had no problem using the same cable and instrument to record to a Mac Pro. My feeling is that it's defective hardware (I'm taking the unit into the Apple Store to see about getting it replaced since the component was DOA), but I just wanted to post this question to see if perhaps there was some obvious setting that I am missing.
In short, neither Garageband nor Leopard (via System Preferences/Audio or the Audio MIDI setup utility in the Applications/Utilities folder) recognizes the fact that I have an optical audio device plugged into the mac mini's audio in port with the device powered. Have I missed something obvious?
Thanks.

Sorry for the confusion - what I meant by "detect" is that because the mac mini has combo analog/digital sound jacks, the way the system works for these ports is that depending on the plug used to connect to the jack, the system will either show, in the case of the audio-in port, "Line In" or "Digital Line In" (or something to that effect) depending upon the plug that is connected. This is how it works for the headphone jack as well. My system behaves correctly for this jack in the following manner:
1) Nothing connected, system preferences shows "Internal Speaker" in the output tab of the audio preferences pane.
2) Standard stereo headset or external speaker connected, system preferences shows "Headset" or something equivalent (I don't have the machine available at the moment to look at).
3) With a toslink to mini adapter plugged in, system preferences shows "Digital line out".
The equivalent behavior does not occur for me for the audio input hence my belief that the port is faulty.

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