will not crank or start

What is your question?

i drove to in-laws, parked Durango. Came out to go home and it will not turn over or start, interior lights are on, gauges are on, headlights will turn on. I checked fuses and relays with no luck. The truck doesn't click, it's just dead. I put my other truck battery in it and it still wont crank. I'm out of ideas.