Just wont start

I'll need to know if the starter turns the engine when you turn the key. If not, does the rest of the power work in the car, and have you checked the battery/cables?

If starter does turn, all "no starts" begin with checking for spark at plug, then fuel at injectors and compression in cylinders, in that order. If you come across a problem in one of those systems, then you need to work your way through the system until you've isolated the bad component.