Ok I think some of you might got it right because it was welding fine. All last week I was welding well into the hours, a couple of hours in fact. And it works fine. But then this happen this week. I also think its the wire drive motor as the leads will not run anymore. When I reset the house circuit breaker, then I turn the power on to the welder, I hear a rattling buzzing sound inside the case. Then it break the circuit again. So what can I do to fix it?? Clean it out and take the lead out... what else will I need to do? Is there any part that need replacing??