Why is my ford explorer not starting?

I have a 2002 ford explorer v6 I was sittin in my car with friends for like a half hour to an hour, had headlights on for a few minutes turned them off or onto parking lights for remainder anyways we listened to music and had ac on for whole time pretty much, I would turn the ac on and off though. I turn the key to start and it begins to studder, it does a little beep to tell you it's on and it wasn't able to do a full beep. The odd thing is everything works, lights, fan, radio odometers even did a sweep and landed to everything as I held the key in place. Everything was lit until like the 6th time I tried starting it then radio time dimmed, but everything else still worked.

Can you post your question in your native language? Or learn a little about vehicles? Obviously you have no AC unless the engine is running which would charge up the battery, but it appears that you put a heavy electrical load on the battery and ran the battery down.