car wont start

HI ALL I HAVE A NEW PROBLEM TODAY. DROVE MY CAR HOME LAST NIGHT WENT TO START THIS MORNING. CAR OPENS UP FINE STARTED TURNING THE KEY 1. 1ST TURN LIGHTS ON 2. IGNITION ALL EVERYTHING WORKS 3. LAST TURN.. NOTHING HAPPENS, NO CRANK NOTHING WHAT I VE DONE SO FAR. TRIED TO JUMP...