Interference/background noise from audio-out port

I've connected my audio-out using a Monster cable from the headphone jack into the audio ports of a flat-screen TV. There's some kind of interference or background static noise. It almost seems to correspond to activity on the computer: if I'm loading a web page or the hard drive spins, the frequency of the static increases. It's rather annoying since I've connected it to watch Netflix and DVDs on the TV.
Any thoughts on what causes it or if there's anything I can do to stop it?
Thanks!

This sounds very much like the problem people have when using separate displays and audio amplifiers. I would try the Radio Shack audio isolator transformer. If that works, this setup also has the ground loop problem discussed in other threads.
http://www.radioshack.com/product/index.jsp?productId=2062214

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