I got a John Deere gx75 2 days ago and it worked fine for two days. The previous owners said that when u turn it off put it in nuetral or you will have a hard time starting it. I forgot to put it in nuetral and now I can't get it started. It won't crank or do anything. It will go in to nuetral but it won't "register that is in nuetral". This mower is very old with over 500 hrs on it. Anybody have any suggestions