STARTING PROBLEMS WITH MY 328i

Ok to start off I dont know a whole lot about bmw's at all I bought this one wrecked and I just got it back from the body shop and im trying to get it to crank you turn the key on but it does nuthing all the lights come on on the dash and info center but the starter doesnt react to the ignition switch at all so i guess my question is does this thing have a crash sensor or does anyone have a clue as to what may be wrong... thanks