Sounds like your ignition lock cylinder was replaced, and now it's not keyed the same. Probably a locksmith can make them all the same for you.

I don't know what year they started the Immobilizer. If it's an immobilizer issue, the key would turn in the cylinder, the starter would crank, but the engine would not start.

They originally came with 2 black keys that open EVERYTHING, and a third grey 'valet' key that will open doors, start engine, but won't open the trunk or glovebox.