This is a very common problem on GM vehicles. The security system is notoriously known to fail. Basically when you insert your key, the system checks for a certain signal. If the system cannot get the correct signal from the key, it assumes the key is incorrect or you are attempting to hotwire it. The system then goes into SECURITY lockout mode. (prevents vehicle theft) This will either turn off the starter, or the fuel injectors. This has been happening with GM's for a very long time. There are ways to bypass this now. Read through this page for info, solutions as well.
My Business Security light on Car not starting Everything else works like...
If you turn the key to ON and leave it for 15 minutes it should relearn the key and be okay for a bit. The halo around the key hole is what usually goes bad. GM sell a kit that comes with a new lock tumbler and halo, but usually you just need to replace the halo. Then go thru the key relearn again and all should be good.
SOURCE: 2004 pontiac grand am car will not start
the security light will flash and disable the fuel injectors preventing the car from starting, if it thinks that it is being stolen. its easy to fix. set the parking brake to turn off the automatic headlights. next turn the key to the on position and wait ten minutes. the security light should stop flashing. then turn the key off and this will reset the security system. it should start immediatly afterwards.
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