We have a 1999 Cincinnati arrow 1000 w a2100 control. Was running fine, but at startup the next day during alignment, XYZ align, goes into spindle align and the spindle jogs back and forth about an inch until it times out with alarm 44-65, spindle align failure; can't find its marker pulse. If I hit the estop while it's trying to find spindle home, I can spin the spindle and the c axis display is active. It also has activity on the load meter when its hunting. Any ideas?