I have a 40w Chinese laser. It has been working just fine for the last 2 months. As of 3 days ago, the laser no longer fires. I have checked inside the electronics bay and the laser power supply does not seem to be coming on. There are no lights on the power supply. There are 120 volts to the power supply and the fuse checks out just fine with a DMM. The fan on the laser power supply does not even come on. The gantry responds correctly when I try to cut a PLT file, but the beam does not turn on. I am new here and am in need of some advice. I have contacted the seller and he is working with me, but he seems reluctant to make a decision on sending me a new supply. PLEASE HELP!!!