OK, so I bought a secondhand xBox, and have modded it with evoX dashboard. Originally controller port 1 stopped working (or at least the controller did when it was plugged in there)

Now today, I have plugged in the FTP lead to the back, switched the console on and none of the ports work with the controller.

It isn't an original controller, it's a logic 3 one. I was working fine on all ports until recently, but now it works on none of them

Any suggestions as to what the issue is, I don't have another controller to test it with

The most common problem that arises with controllers is a break or short in the cable.(usually due to years of stress on the wires) Try testing the controller cable for continuity and shorts.

Thanks. And lo and behold, it's started working again. In port 1 too, so it sounds like you could be right