Replaced ignition switch on Saturn, won't recognize new switch.

Bad ignition switch, replace with new under warranty. Take it back to who ever did it if you had a shop do the work. Something is shorting in the switch.

After the ignition switch is replaced the car won't start with the reason that the new switch has to be re-learned manually or with the help of diagnostic computer.
Manual learning procedure: PLEASE DO AS DIRECTED.
- Turn the ignition switch to ON (Engine off)
- Try to start the engine and leave the switch to ON position. (At this stage car will not start).
-

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: chinasinoy.com

there was a lot of problems with the ignition switch and its the same as the chevy cobalt so you can get it at a chevy dealer

Done cars have a kill switch if they are low on oil. Check your oil. If the oil is good, it may be the ignition switch.

THE IGNITION SWITCH MUST BE PROGRAMMED. TO THE VEHICLES ECU

You have not got the ignition wire connected somehwere. On start-up the engine is receiving power through the ballast by-pass which cuts out when in the run position, the new switch could also be faulty.

the key may be worn badly or the ignition needs to be replaced.

Have you tried unhooking the negative battery cable for about 30 seconds and letting the computer reset itself.

The security interlock on the ignition switch goes bad. The ignition switch needs replaced. (about $35 from the dealer) It takes about 30 minutes to replace and another 30 minutes to "learn" your key. The car locks out for 10 minutes when it fails so if you look in th emanual there is a procedure to override the lockout but it won't work for 10 minutes. Google the problem there are procedures for the switch replacement and learning the key with the new ignition switch.