I recently ran my sound and video to my t.v. and stereo. With my stereo, I get a buzzing or humming sound, and with my t.v. I get a rolling line going up the screen. I have switched the cables on the back of my comp and put the comp speakers in the output for the stereo and I get no buzzing from my desktop speakers. My stereo is brand new and I have a span of about 50ft between both. Any suggestions? Thanx guys.