I have the troy bilt bronco 13wx78ks011 and I used it 2-3 days ago and had no problems with it at all during that time I used it (there was a half a tank)o made sure everything was in the correct positions to start it. I put the key in it, turned the key, and the lights came on, and that was it. No sounds,,,,,nothing. So i hooked the battery up to a charger and it was good to go so what could be wrong or what should i do?