As a long-time resident of bizzarro-world I have pulled off quite a dumb stunt.
Unfortunately that's not all I pulled off.
Removing a couple of unwanted PCI cards from the beast I started unhooking wires that needed disconnecting..
Being a buffoon I then realised they were NOT connected to the cards....No really.
I'm taking a peek at the online manual for the MoBo for the wiring diagram.
My connectors have "A" and "G" on them, corresponding to the female bits.
Is this an indication of which is "Ground, i.e. negative?
This is why I am not allowed metal cutlery.
My ONLY clever move was to hang onto my old PC.