I have th power pro 256 and I went and turned it on like I always do and after about 30 seconds I heard a loud pop from inside the unit and it shut down and popped the circuit breaker. I wasnt welding or cutting with it yet and it had no load when this happened. Any ideas or thoughts out there on what may have happened it sounded to loud to just be a fuse but maybe a capacitor or something went bad it is still under warranty I just don't know what I need to do now for it. Maybe if any of the admin or representatives can send me a pm on what I should do now? Thanks