I have a Dell PC with ATI card that has A/V output. The TV is 20 feet away from the PC. The TV is connected to an Onkyo A/V receiver. I would like to display my slideshow programs from my PC to the TV . The problem is the cabling. I have behind the PC 3 RG6 coaxial cables that go behind the TV. Can I use those cables, using adapters, to connect to th A/V receiver? Is there any appreciable loss using those wires?