Sears Craftsman Stopped Running?

I have a Sears Craftsman lawn tractor model number 917.270781 with a 19hp Briggs & Stratton engine and 42"cut. It was running fine until I ran over a few tree roots in my back yard. The blades did not touch them or stop, but the tractor shook hard from rolling over the roots and stalled. It will not start again. There is no clicking, nothing. The battery is fully charged and there is lots of new gas in the tank. Is this an unusual occurrence and how do I fix it? I just replaced the air filter and fuel filter, disconnected and reconnected wires from the ignition switch to the solenoid/battery/starter and bought another solenoid, but haven't installed it yet. Thank you for any help in advance.