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When my wireless USB mouse receiver is plugged into my laptop, my laptop generates a high-pitched hissing noise that's very irritating -- but only if the CPU is idling. (It goes away when there is CPU activity.)

What's the best way (if any) of getting rid of the noise?

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Is your cellphone near the usb device? –  Dez Mar 23 '12 at 3:16
    
Can you tell where the noise is coming from? Is it coming from the speakers? –  David Schwartz Mar 23 '12 at 3:26
    
@Dez: Nope..... –  Mehrdad Mar 23 '12 at 3:36
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Similar: superuser.com/questions/121883/… –  Ƭᴇcʜιᴇ007 Mar 23 '12 at 4:26
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Also similar (except this one happens even on AC power with no battery): superuser.com/questions/373679/… –  Mehrdad Mar 23 '12 at 22:36

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