Hello,
I have a 250 ex from 2010 that just recently stopped working. I was welding with AC at about 200A, and I heard a pop from within the welder, but that may have been the circuit breaker tripping. Now the welder turns on, and I get the HF start, but it wont switch to the welding current. If I try to scratch start, nothing happens.

Can anyone tell me how to go about trouble shooting this? I opened the box and poked around, but I dont see any obvious signs of something burning or blowing up.

Thanks in advance