Pull cord on push mower won't pull after running over stump.?

Hmm. It sounds to me like you've ceased up the motor. Or you could have just gotten toe pull cord pinned or stuck in there. No way to really know unless you take it apart or take it to a repair shop near you. Not an expert on mowers. But I've done my fair share of damage to them.

It is likely that the crankshaft was bent from the impact if you cannot turn it over. try turning the blade by hand, if you can turn it than it is likely a sheared flywheel key. If not, bent crankshaft.