Well after much ado, I am nowhere.

I pulled the back off the machine to look at the LEDs that are on the board.

There are 2, then another 4 beneath those. The top 2 stay on.

Then, of the 4, the 2nd one is on while my spindle turns.

When I move z, as before, the motor whirs but nowt happens, the LED doesn't light up either.

Only when I use arrow keys to move Y, does an LED light up, and go back off when I go the other way.

I'm stuck, proper. I don't know enough about this stuff.

Like, if the pins are wrong, there are only a finite amount to change them to.