Thanks Solandri. (2) was the issue. I had a power cord running through the wall along side the RCA cable. I disconnected that and plugged the computer in to another outlet. Hum is all gone.
I have a Dell Desktop computer with a micro plug running to an amplifier along a 20 foot rca cable. I have isolated the noise to the computer. When I plug this cable in to my phone there is no hum. When I switch the amp to the dvd player that I also have connected to it, there is no hum...
I would like to run two speaker wires through a wall about 15 feet to my amplifier from my computer. Can I connect them from the microplug on the back of the stereo (left and right channel only) then to the amp via rca plugs using the speaker wire? Is there an easier solution?