So if you have aligned the mirrors and checked the lens. Now your getting into the major expense part of troubleshooting. But before you do that, check for loose connections with a screwdriver please, with the machine unplugged, not just looking. Tighten all those connections on the controller, power supplies and HV power connections. Even on the tube. IF you have lost power and can no longer cut its very important all the connections are secure. Yes they can appear to be working fine and still be loose or sometimes not even plugged, in.

After you get done with all that there ways to check the tube and power supplies. Remember if you skip a step or just do not do it mistakes are going to cost you money. Have you contacted the people you purchased from, tubes and power supplies if needed can be expensive and should have a warranty.