Klipsch ProMedia GMX-D 5.1 and Mac mini G4

I can't get any sound out of these things. I just got them, I'm not a sound techie, but I plugged in the cable with a green end to my mac mini's audio-out jack, and plugged in the analog audio cables (the red and white ones) to the circle shaped sound-controller. The sound controller is hooked up through the DIN cable and power supply from the subwoofer (I think that's what it is) and I have all five of the little speakers hooked up to the subwoofer by putting in one wire end in the black slot and one in the red slot for each speaker. I think I did at least the final step properly. I don't care if I don't get surround sound, I just want to be able to hear through this nice set of speakers. Any response would be awesome, and remember, I'm an audio newb! If you'd rather e-mail me, feel free to do so at panzonito@sbcglobal.net