2012 c250 won't start after replacing the battery.
 

got in an accident and bent up to the front left bumper and the frame a little bit. About a week and a half later while driving it the entire time, it began to lose power and eventually I couldn't start it. Thought it was the battery, so I replaced it and now it won't turn over. There's a loud ding when I turn the key and it sounds like its trying to start up but it just doesn't make it. I've been researching all the different things it could be and I think it might be what everybody's calling the immobilizer please help how do I fix this? I'm great what technical stuff but I knew nothing about cars.