Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you looked under the mower to be certain that there is nothing blocking the blade that might keep it from turning? Are you holding the engine control bail back against the handle?
Has the mower been started any at all? You indicated that it is brand new, did you purchase it in a box and have to put it together yourself?
Did anything out of the ordinary happen prior to your stopping the machine? Did you notice any weird noises? Did you stop the machine or did it die? Are you using the machine as a mulcher? If it was running and working fine prior then the first thing that I would suspect is grass build up under the mower that has the blade stuck, then I would look at the engine control bail to make sure that it is operating properly. Can you turn the blade manually by hand?