Welding machine help needed Hobart

I need some advice on my Hobart 140 welder. It doesn't have a lot of hours on it. I used it over the last 7 years to weld up my roll bar, install frame connectors and to do some welding for body work on my 66 Dart. I pulled it out on Sunday to weld a few brackets on a heater box for my tractor. It worked great on the first bracket but when I went to strike a weld on the 2nd bracket all it would do is lightly spark at the wire. I've tried attaching a very short video but its not allowing me to. Ive tried other ground areas as well as touching the ground clamp with my wire but it just barely sparks. It doesnt even turn the wire red. Where do I go to have it looked at or is it something you think is a simple fix? I can send a video in an email if you think you could help.
Thanks Rod
Check voltage at +/-.