I have my powerbook connected to my plasma through a DVI->HDMI connection. The picture comes in fine. I also have a mini->RCA cable running from the headphone jack to my stereo receiver. The sounds comes in fine. However, when I have both hooked up at the same time, the audio suddenly has a loud buzz through the speakers. As soon as I disconnect the DVI cable from the laptop, the sound goes back to normal. Has anyone had this problem or know of a solution? Thanks.