I have a 10552 that has a problem with th e electric start. It has a new battery and has worked flawless all season. Today I used it and mowed. When I stopped to move something and came back to restart it made a grijnding noise when the key turned. I pulled the motor by rope and finished mowing. When done I tried the electric start agin and now it does nothing, not even a click. I checked all fuses and they are fine. What else should I look at? Does the whole starter need replaced?