Ignition Lock (Replacing)

You know guys let me describe what happened so I can get some further input. My ignition lock cylinder is definitely loose so it needs replacing. But this all came about when turning my car on last week and it got stuck "starting". No matter how I turned the key back it just kept turning over. So I ran out of the car, grabbed a wrench, and got the negative cable off before I burned the starter motor. Input?