What could be wrong?

The serpentine belt came off our car. When we put it back on and went to start it the car tried to start but wouldn't after that it wouldn't start at all! It made no noise at all. Then We tried to jump it by the starter, when we did that the dash lights started to flicker on and off. Then they wouldn't come on at all. The driving lights wont come on either. Then when we shut the car completely off the lights came on and stayed on but we went to start it and they shut off again. We tried again with the starter and the check engine light came on but and everything else didn't, when you try to put the driving lights on the check engine light went off but the driving lights would not come on. If you turn the driving lights off the check engine comes back on but the car doesn't even make a noise at all! We need help!