System is lockdown and immobilized?

Even though the battery is full and all the lights come on its totally dead when I turn it over the lights on the dash come on and there is one I have never seen before which is a symbol of a car in profile with a key inside which I take to represent the system is lockdown and immobilized even though I only use a ordinary key to open and lock the car it seams also to have stop the steering lock from functioning please help