did you try ground loop isolator?
something like this:
I am getting a fair amount of HDD noise through my speakers. I have an Asus Pundit MB using onboard sound (SoundMax). The HDD noise drives me nuts, especially if I'm playing a quiet song. The harder the computer works, the worse the noise gets. The engine speed does not affect the noise, plus I have a nice solid ground point, so I don't really think grounding is the issue here.
I did read where some people had success eliminating HDD noise by grounding the PC chassis. I tried this, but it did not help. I also tried using a cheap usb sound card instead of the onboard sound. That didn't help either. My next step is to try using an Audigy PCI audio card that I have laying around. Is there anything else I should try?
http://www.bestbuy.com/site/olspage....=1122655296186, it is the only one I have used that does not muffle sound quality, infact it improves it. I use an isolator on the front, rear and sub. The price ($17.99) is a bit much, but like I said it does not mess up sound quality. Try Ebay'ing it, I got lucky with mine and got 5 of the units for $20.00.
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I broke down and bought one of those isolators (IEC GLI) off of Ebay. It came to $11 including shipping, so not too bad. In the meantime, I'm going to keep fiddling around and see if I can't solve the problem without the GLI.
You have to check windows sound mixer and make sure all unused audio sources are in mute (mainly mic, aux, line in, etc).
In 90% of cases mic input picks up noise from HD and other sources, it's very sensitive, this is norlmal. Just mute all unused audio sources.
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The only way I think is possible is to put ferrite chokes over each of the cables of the device that is creating or receiving the noise. Its worth a shot.
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