Smoking serpentine belt?

I put on a new serpentine belt correctly as far as I can tell. Also took battery in to be charged. When I turn the key to crank the car, first it feels as though it doesn't have the power to turn over. Like its struggling to pull loose. I kept trying to crank it for a very short spell and then it began to smoke. I didn't see exactly where it was smoking because I freaked out and turned it off really quick, but it was from the belt area. It's a friend's car. They dropped it here with a belt snapped in two. If a component is stuck or frozen up how do I know? With no belt two pulleys spin freely as well as the tensioner. How do I test the other two pulleys or diagnose my problem?