HELP I need a Christmas miricale! Beam not firing

[Gabe Gat]

Hi everyone, I have a ULS-PS50

All the the sudden my beam as stopped firing. I ran a job all was well, next job it ran the file (went through the motions of the engraving and cutting but the beam didn't fire) the lights are all indicating the the laser is good and firing, the BEAM light is on when it should be, the water cooler is on and running the interlocks are in place. I'm at a loss i don't know what's up. I turned the machine on and off a number of times trying jobs in-between, at one point I got a since circle to run and cut no problem. turned the machine off to go back inside to grab a coffee, went back out and back to the same issue. I've run tickles configs, removed the RAM and re-set just for good measure.

Any ideas?