5.1 sound system with macbook pro

Hi I just got the Logitech Z-5500 sound system setup for my macbook pro. I'm trying to hook up the digital output using mini-toslink to toslink cable and digital coaxial audio cable.
However, my Logitech control screen says that it does not detect any digital data. Under my sound settings in system preferences, I can see the digital out. And when I go to Audio MIDI Setup--> Configure speakers, the 5.1 option is shaded out. It's the same when I select Encoded Digital Audio under the Audio Output.
Right now, my speakers can play sound but it's not 5.1 and there's no sound coming out of the center channel and the rear channels. The Macbook Pro should be able to automatically detect the 5.1 system shouldn't it? Or is there a problem with my digital output? Any help would be great. Thanks.
Message was edited by: mhl12

nevermind.. i just need to adjust my Logitech Control "effect" settings to DPLII Movie/Music.

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