I have been noticing an interference pattern on "certain" (only a few, not all) cable channels. I had tried re-routing cables, new cables and ferrite beads and the problem persisted.

I have a "Glare Screen" to reduce glare and UV rays from the monitor connected to this system. It is a type that has a grounding strap. I usually have the grounding strap attached to my PC. Last night I found the problem. As soon as I disconnected that grounding strap the interference went away. The gounding strap/glare screen was some how receiving an electromagnetic signal and transmitting it to the PC.