What should be done after replacing a battery and it still will not start in a lawnmowerShould I check all the connections?

The starter solenoid might be bad. Try running a wire from the positive post to the starter and see if turns. If it does, solenoid probably bad. Also, check to make sure ground was put all the way back on and to make sure that the ground is still hooked to the body of the mower. Good Luck!!!