I bought a lawn mower about a month ago; I used it once and it was fine now today I tried to use it and it started and stopped right away. It is like the engine turns over and goes dead immediately. It is a Poulan with a 5.00 Briggs and Stratton engine. I changed the oil, checked the spark plug, check the filter... I am stumped.

I need help please. What more information do I need to submit with this question inorder to get a reply?