I probably would not purchase a JD D100 or any other entry level unit as they would not hold up for me but they are just fine for some home owners that have the need for a rider and/or can't use a walk behind for many various reasons. That being said......it probably does not have a JD motor. What motor does it have? Have you checked for a blown fuse? Hav you looked for a weak or corroded wiring harness connection? Does it try to start? Is there any spark at the plugs? Is it getting gas? Lots of questions as you provided very little info to work with.