Here's the deal. I want to have four point surround through my computer's sound card and I have two front computer speakers that work fine, but I had two rear computer speakers but I blew them out. I then decided to attach two extra speakers to my receiver and run an extension from the rear output of my soundcard to the receiver and have rear sound out of those speakers, but there is a loud humming noise, very, very loud! whenever I have the computer on and those speakers on. My friend said that it was interference from my computer's power source and you cant get rid of it unless you buy an new system like the Cambridge DTT3500 or Four Point Surround systems or other computer speakers. I have tried different wires and connector and still the same humming noise. Is there any way to get rid of this buzzing, humming when running sound from my sound card to my Sony receiver? Also the same thing happens when I run my dreamcast through my receiver with the VGA adapter only the humming sound is much less but nonetheless still there!!! Any suggestions would be greatly appreciated.