I hate to hear that.  Here are a few things you can check next:

* The spark plug: Make sure it is clean and has the correct gap.
* The fuel filter: Make sure it is clean and not clogged.
* The carburetor: Make sure it is clean and adjusted properly.
* The air filter: Make sure it is clean and not clogged.
* The fuel lines: Make sure they are not cracked or leaking.
* The battery: Make sure it is charged and has enough power to start the engine.

If you have checked all of these things and the engine still will not turn over, you may need to take the lawnmower to a qualified mechanic for further diagnosis.
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