I have my computer pluged into Video 2, when there is no sound coming from my comp, I can here the radio bleeding through. It's relatively faint but definetly noticable.

I changed to video 3 where I nothing plug in & I get the same problem.

Any ideas.

Better grounding of your components and possibly better shielded wires.

I have heard of this problem occurring with powered computer speakers -- unplug the power to the speakers and it goes away. Don't know if it applies to you.