History, have replaced just about everything on this boy, switch, computer circuit aboard, carb and has been running good but now a new problem. Before when I would start mower it wouldn't do anything and I would flip the PTO mower deck switch on and off and it would start, didn't have to do this every time but occasionally. Well now nothing so I replaced the PTO switch and still nothing. Turn switch on and red and green lights on circuit board light up some of time and some times not, not sure what that means. Battery is good. Any thoughts, thanks