I'd like to play my Sirius Radio through my g5 iMac. I've plugged a mini from the headphone out of the radio into the mini audio in the iMac, but am not getting any sound. I can see it's receiving something, as it's getting a nice level from the input meter on the Sound Control Panel, but no sound is coming out. I'm still getting sound from the computer (alerts, iTunes, web, etc), but no sound from my radio is coming though the computer. Switching the outputs from my Soundsticks to the computer speakers doesn't change anything. Any suggestions?