Janome 6500. I have a Janome 6500 that was working just fine. The last time I opened the machine

Question

I have a Janome 6500 that was working just fine. The last time I opened the machine the display window wasn't showing anything. The machine made the usual sound as it came on but no display. It will sew but keeps getting jammed and of course I have no idea what setting it is on without the display. Can you help me??