The SVGA extension cable - there's a couple of no-connection lines in there - perhaps if those aren't wired-through it explains the inability to work. A straight-through 15-w D-type M-F should work without too much drama. Not sure what you mean by the USB controller - unless this is a Windows->pendant interface?, in which case, again, the lack of cabling may possibly explain that (not sure).

The FET behaviour, as described, is borked.