Plasma cutter stopped working

[redram08]

I have a Miller Spectrum 375. It has suddenly stopped working for no apparent reason. It was working the last time I used it. I start it just like I always have; I check the air pressure; everything appears normal, but when I pull the trigger, nothing happens - no arc. Is there a particular problem that frequently crops up with these machines?

[cruizer]

Probably trigger circuit in the torch is open.