That sounds like the switch is engaged (switch contacts inside the switch are making contact) when you power it on. I don't remember if lukes triggers have trigger stops. But if it does then the return stop is too tight. If they don't verify that there is a slight gap between the trigger back and the switch "button". If there is not then pull off the grip panels and loosen the screws that hold the switch in place and see if you can get a gap.
If it still doesn't power up try removing the switch (leave the wires attached and it plugged into the board) and make sure nothing is touching the contacts on the back of the switch and try powering it on. If that works then something is holding the switch closed enough to make contact (or the contacts on the back of the switch were somehow shorted). If not, well then I don't know...
Good luck.