2002 Ford Explorer It won't start

If its cranking ove and will not start do below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 in away from ground have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor /distributor pick-up coil, ignition control module, ECM, Ignitor camshaft and crankshaft sensors and computer. Note: If it doesn't apply disregard it

No crank at all-could be the starter relay, transmission range switch and ignition switch

It is not turning over [lights up, though] and it won't start!

Is it cranking over and will not start or just won't crank over/nothing happens when you hit the key