Hi, you fried your board, you changed the Z probe, you modified the firmware ... It seems this machine has had a lot of history, huh ?

Did you do this on your own or based on PB Support help ?

Can you describe what you mean by "nothing " ? The head doesn't move or the z probe doesn't trigger when close to metal or the probe triggers but the head doesn't stop moving ?

Regarding head going in the wrong direction, it has nothing to do with the sensor, more to do with the board, how the Z motor is connected to it, the firmware and your inputs in the control software (repetier ?). Can you detail if you had any interaction with any of those ?

Regards