This could be a lot of different things. I would start with something easy, if you have a spare paper supply then you can hook that up and give it a try to see if it works. But if bought used there is always a chance that someone tried to downgrade it and flashed a bad flash to it and well now it is a brick. If you have a progskeet hook it up and ground the tri and so it will stay on and see if you can get a good dump from it. This will solve if that is the problem.
Ok on for the next problem, if it were downgrade try, sometimes they mess up on the hooking the progskeet up and wire something wrong and end up blowing a fuse on the board. Did you test the voltage out with a multimeter. Thanks