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If the sound is normal when the comp isn't connected, then the computer causes the problem. Check the cables between comp/mixer and you also should try to connect the mixer to a different power plug than the computer is.
I have had buzzin interferences when my computer was plugged with my amplifier in the same power plug.

Added photo to clear things out. I used this kind of power distributor to plug everything together. I had the buzzing sound, but it disappeared when i plugged my amp to a power source which comes out of the wall.
Edit: Oh... you are from US. Then the european power distributor system doesn't apply to your system. Maybe..
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