I'm well aware that ESD damage isn't visible from the outside !
What I wrote is that the board is dead and has no visible "Outside damage" while examining is thoroughly so probably one or more IC's are dead, which can be caused by ESD.
It's one of the cleanest SE/30 boards I have had in my hands, nevertheless it's dead.
I've been going through the power schematics today and everything that should have power actually gets power so that isn't the cause, so it can be the video circuit, broken CPU or fried IC's caused by whatever...