Crank no start
 

Hello. I have an 01 Grand Marquis. When I try to start it the Pat's light will flash fast and it'll crank and not start. If I turn the key off and turn it on again it may flash fast it may not. When it doesn't flash fast I just turns off the car will start sometimes I have to do that 15 times before it'll start. I put a new computer, a new key reader in the column, and had the pats system reset. Does anybody have any ideas?