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Ok. Its an old black plastic macbook. What i want is audio and video from one hdmi cable. I already have that monprice cable i linked in the op is there anyway to make that work? or should i scrap that cable and do this some other way?
 
The cord you have cannot be made to work. You need a mini-DVI to HDMI cable. There is not (that I know of) a one-cord audio/video solution for mini-DVI Macs, so you'll have to run the audio via a second cable.
 
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