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Original post by: mayer ,


The cable you are having problems with has nothing to do with the sound.  It is the connector for the optical drive.  I suspect that you have failed to fully seat the audio board.  Go back and reseat it.  Here's how:  [guide|1113]

Also, after you have reseated, let us know if there is no sound.  Go under the Apple to about this Mac > more info > system report > Hardware > Audio and let us know what it shows.