What could cause a car not to start and do nothing when you try to start it?

I already replaced the starter and solenoid, ignition switch, ignition module and coil. It will start if I short the starter solenoid but does nothing when I turn the key. I know its got to be something electrical but just don't know what it could be. The security light goes on and off like it is suppose to so... show more I already replaced the starter and solenoid, ignition switch, ignition module and coil. It will start if I short the starter solenoid but does nothing when I turn the key. I know its got to be something electrical but just don't know what it could be. The security light goes on and off like it is suppose to so i know its not that.
Update: It is a 96 camaro z28 that wont start.
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