All help Appreciated: while using my 790 the battery holder came loose causeing the battery to move and dislodging a battery cable. the tractor immediately stopped. and after determining what was wrong proceeded to reconnect the cable and fasten down the battery. when attempting to start the tractor in will turn over, but will not start. the engine is a yanmar diesel. Also I noticed when trying to start the tractor it has no smoke coming out the exhaust. any suggetions please.