I've had this welder for several years, and never had any issues with it, until today. Was welding some 1/4" steel and all is well. Went to strike an arc and had no arc or wire feed, and the power light was off. Turned the power off and on and I could start welding again. This happened several times and finally it would not restart. Checked the easy stuff and couldn't find any issues. There's no evidence of smoke escaping from any component and no funny smells. I do have power through the switch, but don't think I'm getting any power to the boards. Anyone have any ideas/suggestions about what I should check?