Think logic and get a multimeter..
If it does everything except firing there are a few things only to check:
Does your controller send the signal to fire to your laserpower high-voltage supply?
are all the supplies to the HV-supply ok? (230V, waterswitch etc.)
Try to get a manual of the High-Voltage supply.. There is a way to test this "stand-alone) with just a few wires and maybe a potentiometer.
Kees