The display is flickering and very staticy / shakey. It is constantly flipping between 525i and 525p modes, and this is happening through any input video source. It basically looks like a really bad VCR/VHS tape output. Very chaotic.
Thanks to this mention I was able to fix my XRGB-3 PSU!
So it seems this is a capacitor issue in the XRGB-3's PSU. My Furman units are 120V 60hz. Could connecting my XRGB-3 to this blow the capacitors? or was this just something that happens over time with the XRGB-3's PSU? I/P on the XRGB-3's PSU says 100-120V 50/60hz. Same with the XSelect-D4. These always worked just fine in the past. Should I have been using something similar to a Step Down Transformer to ensure safe operation of the unit?
I think it's something that happens over time, I use an EU step down transformer I've had since around 2006-07 when I bought the XRGB-3 from Play-Asia.
Reliability has been poor the last few months, it would only work after letting it stay on for 30 or so minutes to "warm up" then powercycle it once. I let it stay on for a few days until it entered the same state you described. I guess that finally depleted those two capacitors.
This is what the PSU looked like when I opened it:
It doesn't show up very well in the photo but the blackness was actually a small blob on top of the capacitor. The one on the left clearly slighly bulged/opened.
With those two capacitors replaced it's now working perfectly again!