I have a system with a few components in it, but to simplify, with everything disconnected except for computer, receiver (marantz), TV and amp, I get noise in the audio chain. The noise becomes more pronounced as the gpu starts pulling more power for playing games etc.
The connection from computer to receiver is hdmi. RCA from receiver to amp. All components, except for TV, are plugged into the same power strip.
If I put in a cheater at the amp, all noise goes away. Disconnect the computer HDMI and the sound goes away. So it is definitely between those two. If I plug in the hdmi to the comptuer then just touch the other end of the metal tip to the hdmi cable to my receiver, bingo, noise is back.
Pressing mute on the receiver and no change. Change inputs on the receiver, no change. Disconnect TV and no change (so it isn't part of the loop it seems).
So the question now is, what should I do? Just leave the cheater or is there another solution to hdmi allowing ground loops? No balanced outs on the marantz.
"Don't touch that, this isn't your house and that isn't your tv!" she says.
"But look at it, the contrast is completely blown out, the color is all off and that tint. This will only take a sec..."