Problem with my Gecko G540 control unit.

[JAZZCNC]

Another reason may be that the charge pump switch could be set to on. Without a charge pump signal being sent the g540 will remain inactive

Machine was working so doubt it will be Charge pump unless the Parallel port as gone Tits up.! (Which does happen)

Alan charge pump is safety function where the G540 will only turn on it's outputs if it see's set frequency coming from the Parallel port. So you must have the parallel port cable plugged into PC other wise the G540 won't see the signal and remain inactive. To eliminate this from the search you can turn it off using the little switch in the bottom right corner.