I have a Macbook 1.1 and am trying to connect it to a Samsung TV to watch movies. I have the appropriate HDMI connections to get the TV screen to work, but I cannot get the sound to run through the TV. I plugged the single prong end of the sound cable into the headphone jack of my Macbook and the two left and right plugs into one set of sound ports on the tv. I went to the sound section of the system preferences and the only output listed was the headphones. Anyway, I could not get any sound to play. When I unplugged the single pronged end of the sound cord from the headphones port in my macbook, the sound worked through the computer. I have had this problem on 2 tvs. My headphone jack works with headphones on my computer. The court works to connect an ipod to my stereo, so I am confident that all of the hardware works. I will appreciate any ideas that any of you can come up with. Thanks.