Power Arc Plasma Cutter

I was duped into thinking these were a legitimate piece of equipment, (my mistake) after purchasing I found the unit will not power on. Is there any where that may be able to find the problem with it and repair it? I have no documents with it. The person selling these told me he inherited them from his Grandfather. I only paid $300 but it's not like it was Free. Any help would be appreciated. Thanks.