When i plug it in and turn it on the VRD light comes on and wont let me do anything. No gas flows, no arc, nothing. When i read up on it the manual says to cycle the power off and back on. Well when I flip the switch to off nothing happens. I checked the switch and its fine. Oh yeah just before this happened when i would turn it off and on i could hear a slight crackle from somewhere in the machine. i am at a loss, unplugging it and plugging it back in does not work so what do I do now?