I'm trying to help but this isn't productive thus far.
It is pointless to conduct any diagnoses until you have measured and confirmed that you have healthy voltage.
It is pointless to chase down the cause of noise when you have major system failures.
And I have a feeling that when the installation is corrected that the noise will be gone.
You must have a dependable foundation to build upon.
Let's start from scratch. Get a decent multimeter and read the manual until you can measure 1) DC voltage, and 2) DC resistance in your sleep. Then we can pick it up again and save you a ton of time and frustration.