Need help, truck almost caught fire, and no longer starts!!

[Camacorn]

So I went to start my truck up the other day, it started up fine, but after starting it up, a huge cloud of smoke started pouring out of all edges of the hood, and inside my cab. I shut the truck off, and disconnected the battery immediately.

I'm not sure what caused it, and I see no melted wiring, or blown fuses. But now when I go to start it, nothing happens. The ignition does nothing, in any position. And my hazard light switch does nothing as well, although the horn, headlights, and brake lamps work.

What is going on, and where do I start?