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When I shut down the computer, the speakers make a whining noise that changes pitch as the power turns off. Also, a couple of times, while the computer was on, I got a weird "data noise" like the sound effects they used to use in movies to indicate a computer was processing, or like a cassette tape on rewind. Wha's up with this?
 

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My opinion (im an audio guy not a computer expert) is that your speaker cable aren't properly shielded, and they're picking up noise (interference made by some of your computer component).
 

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If you don't have any luck with new speaker cable, there could also be interference from inside the PC.

Open Volume Controls and mute any devices you don't need (eg Auxiliary, Line-In, Microphone). I had the same problem with interference from my TV card's line-in.
 
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