How can I fix this ground loop problem? Is there a gizmo or something I can affix? Here's my setup - PC S-video out to Onkyo receiver video in PC coax digital audio out to receiver PC stereo L/R IN from receiver tape out (for recording LPs onto CD) TV has CATV of course, so does the PC (HSI) Problem is there is a ground loop when I connect the PC to the receiver, using any of the 3 cables... On the audio, listening to ANY input (DVD, TV, radio, phono, etc) I get a nasty hum, and when viewing the output from the PC on the TV, I get an upward scrolling light/dark line. If I unplug the PC from the receiver (all of the cables) it goes away, but how can I fix this? I have a GLI thing for the audio which takes out a lot of the hum, but only on that 1 input, and doesn't help at all for the video..