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For the humming, I agree it is likely a ground loop problem.
A ground loop isolator may help but it will also make the music sound like it is coming from down a hallway. They are cheap and easy solution, you can buy them at WalMart.
A better solution is to properly ground all of your components. There is a good article in the forums at sounddomain.com. It is a stickly in one of they forums (Installation maybe?). I don't have the link handy. A professional car audio installer should know the fundamentals of grounding and can apply it to your computer setup. I don't know any professionals so I've always been dubious.
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