Why won't a 2004 ford explorer start the battery is fine the lights work there is no noise when turning the key on?

Defective starter solenoid.

It's the key or ignition or both I speak from experience I had the EXACT problem.I checked the battery,the starter,silinoid,starter relay and nothing.Everything was still good.I took it to a Ford dealer and had my key replacedand vehicle reprogramed.It worked