I ahve an exmark mower. I used it and it worked fine. I cleaned it off after I was finished cutting and let it cool off. When I tried to start it nothing happened. I tested the starter and the batery and both are fine. I noticed that when I have the blade PTO disengaged (off) nothing happens at all. When I engage the blade PTO, there is a single click that seems to come from the blade electric clutch. This seem backwards as I believe there is not supposed to be any action when the blade is engaged and you try to start the enging. If anyone can help me with this it would be greatly appreciated.