I could not get my mower to start(solenoid clicks but does not turn over), I checked solenoid, battery and safety switches and all were fine. Tried going directly to the started and it still would not turn over. Finally i lifted the hood and popped off the cover over the top of the engine and after some effort I was able to spin it with my hand. Once that was done it started! Had to do this again though to re-start it the next day........any idea what actually may be bad?