HP Z545 no sound on optical output. Win XP MCE.

Hi.
I have HP Z545 with Windows XP Media Center Edition with all latest updates including HP drivers.
I'm trying to use optical output as a default sound output, but for some reason it's greyed out in mixer (see screenshot http://img849.imageshack.us/i/img0192g.jpg/).
At the same time the realtek sound panel shows "Output digital only" (see screenshot http://img857.imageshack.us/i/img0191v.jpg/), but for some reason it doesn't work
Any ideas how to make this thing work as I want it to?
Best regards,
Val

Matt,
The Digital out from the soundcard is of electrical type and not optical type so you can't use optical cable with the Digital output jack directly. If your HT system support digital coaxial input, you can get a 3.5mm to coaxial cable for the connection instead.
Jason

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