Mac Mini Digital Audio Output

Hi,
My friend is trying to use the only audio output from the Mac Mini (1.42 GHz) as a digital out. He was under the impression that when you hook up the right cable (which has bought and we double checked-optical audio cable with Toslink adaptor.)
But when we go to pref. menu there is no selection for digital audio out except for the regular line out.
Any ideas or tricks to getting digital out on this Mini?
Thanks,
Babak

Does he have the 1.42ghz G4 Mini? If so, that model is not a digital/optical audio out jack, at least not the 1.42ghz model I have. Did not check to see if a later update prior to the intel switch added the port to that model. My 1.66Ghz intel mini has the digital/optical audio out. Tell your firend to check the manual that came with his mini, it will tell you if it is a digital/optical out port or not.

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