So I bought the new LU2-4 laser and have retrofitted it to my LM2 (the plug on the new wiring harness is a square plug, the old is a rectangle). I had the 7w laser previously and wanted more power. I can make the gantry move and even frame where I am trying to burn. If I hit the fire button I get no dot and the laser head doesn’t appear to power up. I’ve made sure the same color wires go to the same color wires on the new laser module and I still get nothing. I’m not electronically inclined enough to what is going on. Any help would be greatly appreciated.