the minivan hit other vehicle from behind. front bag was deployed, the key got stuck in the on position. Firemen disconnected the battery to turn the ignition off, to prevent a fire. after moving the transmission speeds in the lever, i could remove the key out. now I CAN TURN THE IGNITION ON WITH KEY, LIGHTS CAN COME ON BUT DOES NOT CRANK AND DOES NOT START. CAN SOMEBODY HELP ME OUT TELLING ME WHAT IS WRONG HERE? THANKS.

 

Assuming no noise from the starter at all when you turn the key.
Are you sure the the transmission in park? If the car thinks the transmission is not in park it will not send power to the starter.
is there power to the starter? any damage in that area?

 

Do you get any sounds when you try to crank the motor? A click or series of clicks? How badly was the vehicle damaged? The starter is right at the front of the van, as well as a fuse box and many electrical connections. If the front end was banged around hard enough, I can see how some connections might have come loose. Check your battery for sufficient charge too. Even though all lights come on doesn't necessarily mean it's putting out a full 12V, which the starter needs in order to crank.