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The PC has the following cards: GeForce 3 Ti200, Intel Pro/100 NIC & Soundblaster Live. Note the quick disconnect on the right side. I had a terrible ground loop, with different power supplies for the PC & AMP. I could hear the screen being drawn, the mouse move & HD access. It was really strange. This wire is attached to the screw holding the sound card in, and attaches to the ground going to the AMP. It eliminated my noise problem.