I'm not sure what you are asking but there are at least two basic scenarios here:
1. The security light is on and the car won't start.
2. The light is on and the car runs fine.
If #1, then you may have an issue with your key, the wiring, or something in the ignition switch broke.
If #2, a number of things might have broken or come loose that allow that circuit to stay open. I know people who ignore it and have been driving with it on for years.
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