Do you mean engine will not turn with key in start position as if the battery were missing? Sometimes people mean different things by wont turn over, to me the way you stated, sounds the way i described. Anyway i am not sure on this year if the security system will prevent the engine from cranking (turn over) or just keep it from starting (fire up). I know the later years it just wont let the engine fire up and run.
So it could be the starter or starter circuit. Maybe another tech. will know more on the security system. So wait a little while!
Reply to this answer though with info. about the engine turning over as it will help others.
Yes the security light blinks, but nothing when the key is turned. The steering column was replaced and the original ignition was installed. The ignition that came with the replacement steering column did not turn the car over so we put the original back in. Even went so far as to take the computer out and put it back in. The battery is fully charged.