I'm a recent PC to iMac convert and have hooked up my iMac to my TV receiver (DVI to HDMI connector and a Toslink cable to the audio). The issue is as soon as I plug in the audio connector the iMac speakers stop working. I'd like to leave the connector plugged in and still be able to use the iMac speakers. Of course when I play a movie on the TV I'd just mute the iMac speakers. Any suggestions? Possible?