I was driving my car and suddenly stopped. on 2004 Chevrolet Trailblazer

I tried to turn it on and would not start. The gear shift turned loose and car would go on reverse when I pressed on the brake.

Asked by for the 2004 Chevrolet Trailblazer
1 answer
Does it crank over when you try to start it? Do all the lights come on with key on? Need more info.