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I mean the actual monster cable audio cable.
To troubleshoot any audio problem just follow the flow of the system.
1st test the source, hook up a pair of computer speakers to the computer's output. do you have the noise now? If yes, then the problem lies within your computer, either swap the computer or try to use a different audio output. USB audio outs are not that expensive, you could try one of those if the computer is the problem.
2nd. if the noise is gone when you listen through the computer speakers then the computer is good, so test the audio cable. Run a different audio cable from the computer to wherever the other end of that monster cable goes. just run it loose and not tucked in to the car. If you have noise with the new cable then your monster cable is probably not the problem. If the noise goes away, try running the temporary cable alongside the the monster cable and see what happens. If the noise comes back then, you should seek out a different path through the car from the computer to the destination and your monster cable is probably okay.
If the noise is still there in the temporary audio cable, then the sound is entering the system after the Monster Cable. What is the monster cable running to?
The things you describe with your positive cable shouldnt' have anythign to do with this noise if you can still hear the noise using an ipod since the ipod is not powered off of that line, but I agree with Dave on his recommendations.
Let us know.
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