03 olds alero won't start

Another thing to try is to turn the key on, without trying to start, if the security light comes on and starts blinking then leave the key on until it stops and goes out altogether. Then turn the key off and start the car. If it starts you may have to do this from time to time. If it does not start then hopefully someone else will have the answer....GOOD LUCK!

Check pcm fuse on driver side of cash it's labeled on over 10 amp red fuse

(1).Or possibly ignition switch look for security light on if ya have security key ignition ignition switch which is not to be confused with key cylinder lock that is what goes into ignition switch ....or ....(2). vehicle has been stalling slot and have restart or wait it may be ignition control module which the coil packs(where the spark plugs come out from ) sit directly above its a square plate with plug in it both these solutions I've come across on various vehicles