Please note: I (SlinkP) have not tried this technique, and it could be risky.
As a last resort, make an electrostatic shield for your soundcard. This is a slipcover shaped like an inverted "U". Usually people make it out of tin foil sandwiched between two thin layers of a non-conductive material like cardboard. Next, you cover the whole thing with electrical tape. Make absolutely sure that no tinfoil is left exposed, or you could cause a short circuit that could seriously damage your hardware.
Now slip this cover over the soundcard.
Note that the shield MUST be connected to earth (ground) to take effect. The easiest way to do this is probably to connect the foil to the computer case (chassis) with a wire. If you don't make this connection, you could actually make the noise worse!
Michael Brown reports, "Beware of hotspots in the computer, and of restricting the airflow to the card you have just wrapped :) I've tried this one, and it made no measurable difference [in noise], I guess the hash in my case is on the power lines."
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