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I have a static noise coming from my headphones when no music/noise is being played on the computer (running Windows 7).

I have tested with 3 pairs of headphones using Realtek High Definition Audio 6.0.1.6196. When there is a noise output, the fuzziness stops.

What could be causing it?

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there is a noise output, the fuzziness stops - please elaborate, you measured stops or just don't hear low-level pickups? – Lazy Badger Mar 24 '12 at 5:26
    
Ok, so when there is any audio output from the OS, the noise disappears. A good test is the test under Advanced in Headphone Properties - clicking this provides half a second of silence, then the example noise is played completely clear, then once its finished the "fuzziness" begins again – rickyduck Mar 26 '12 at 10:49
    
You can try to test with another (preferable Hi-Fi level) sound-card. Your card or badly designed or (more probably) poorly assembled – Lazy Badger Mar 26 '12 at 10:59

It could be leakage of electrical noise - the cables behave as an antenna and pick pick up stray electromagnetic signals.I've had electrical noise leak into a pair of headphones plugged into a desktop (in my case, a dell inspiron 530). Its less static, than something that sounds vaguely like the sound you get when a handphone gets a text near speakers

There's not much you can do about it, except maybe somehow shield the cables in question.

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In the case of noise, captured in a short antenna with the such level of the signal intensity of the electromagnetic field would be shown a much better and earlier - hair loss and other signs of the impact of power HF-waves – Lazy Badger Mar 24 '12 at 5:23
2  
Well, it does sound similar to what a induction coil mic picks up from the average piece of electronics.In addition, its a VERY short distance between the source, and whatever is picking up. Feel free to post a scientifically accurate, presumably cited answer. – Journeyman Geek Mar 24 '12 at 5:29
    
I feel free to ignore this request - I don't want to answer, I only, with all due respect, show you some your mistakes... See difference?! – Lazy Badger Mar 24 '12 at 6:55

Seems like you need a ferrite choke(those strange lumps you find on random cables). Google it. The removable ones are hard to find, but they do exist.

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can you add a link or two explaining how this solution should help? – Lizz Mar 21 '13 at 5:46

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