Small Engines (Lawn Mowers, etc.): Scotts 1742 will not start, safety switches, seat safety

Question
Mower turns over great, has plenty of gas (wet plug too) but will not fire up.  I've driven it all summer with no problems or hesitations until now.  I'm going to pick up a new plug tomorrow to see if I have good spark.
Checked all the connections, fuse, fuel and air filter and everything is in good order.  The mower is fairly new.  The service indicator light did come on when I drove it last and was wondering if that could be part of the problem.  Is there a way to reset it?  Thanks

Answer
 Hello Tony:

 Send me the Model Numbers Off the Mower and the Engine, Please. With these Numbers I can see the Mower and the Engine you are Working on. You need to Check for Fire at the Plug. If No Fire, then Check the Seat Safety and the Blade Safety Switches. Hope this Helps. Let me know waht Happens, Please.

 Good Luck

 Respectfully

 John