I'm using a Fanuc 15-M controller to run a DeVleig Mill. Recently when I powered up the machine, before pressing the '"Machine Start" button, my "Spindle Off" lamp is lit. This was never the case before. With this switch active of course, whenever we try to turn the spindle ON, nothing happens. I have removed the switch and physically checked its operation and it's fine. Can anyone tell me what's happening and how I could possibly solve this problem.