2002 Ford Truck 2002 F-150 want start

This could be a security problem if security is flashing. Unlock pass door with key and then drivers door. Only if security light is flashing. Is the ignition key in good condition. Coded key if not a prob with key or security. Then check all fuses. Check relay center. Make sure check eng light is on while the key is on. Check solinoid connections on starter. Check injector pulse. Check inertia switch has not shut down. Good luck billymac