Looking for some help here. This is our first Sinker. I went on a limb and purchased a used Charmille Roboform 20,1991 year model. Ive got the power ran to it but when we turn it on we get a screen with 4 options, Monitor, Charger, Initialize and Continue. It doesn't matter which option I press the machine does nothing. Am I missing something. Do I need to press or do something else? Is there a disk I need to load. Im pretty lost on this one