I was concerned about the clear plastic side, yes it has one to show off lights I guess.
I saw somewhere that a ground shunt (I think it’s called) might help. Where i take a wire from receiver case to comp case may help with the hdmi noise.
It does make a big difference when I put the pc on a different “branch” or basically run extension to another room, so I dont want to return the isolation transformer just yet.
I did not get a chance to work on all this much yet. I was sidetracked with a brake job that took 3x too long. Hope to get to it ASAP.