I have a 2008 mac pro and I just got a home theater setup with a Samsung Plasma TV, Klipsch speakers and a Pioneer 1019 AV receiver. I picked up a DVI to HDMI cable and an Optical Toslink cable. I can get picture on my plasma but I can not get the audio to come through. I have changed my system sound settings to digital output but I still can't hear anything. The toslink is going into the receiver. Has anyone had success with this or a similar setup?