PowerPlasma 50 problem - Spark but no HF arc

[Kapoor]

So yesterday my father was cutting with his powerplasma 50 and then it stopped cutting suddenly. He was cutting 14 gauge steel sheet metal (and sheet metal is the only thing he's cut with it for the last 2 months). Well it looked to him like the tip went bad, so he changed it however we got the same problem again. Spark for a second and then nothing. The pilot arc did the same thing, and still does. So we opened up the machine just to take a peak inside and it all looks good except for one connection on the top circut board, it looks like it's burn. I'm not sure how it would short out like this, humitity is tops 40% out here and he has an industrial air dehydrator. Here's a picture

http://img.photobucket.com/albums/v7...1-26102745.jpg

You can get a hold of him (Tony) @

Thanks for any help