If it's a 6Z935 it's the exact same welder we have at work, and that thing is entirely a piece of shit. Hands down the worst welder I've ever used. No matter what you paid for it, you paid to much. If you traded a cup of coffee for that thing you got ripped off. You'll be better off sticking metal together with JB Weld and chewing gum. Bypass the misery and put it on Craig's List right now. I'm sorry for your loss.
edit: I just noticed that was your first post, welcome to FSB.:thumbup