What's wrong with my ignition? Why won't my car start?

What is your question?

Everytime I try to start my 95 Riviera, the security light just flashes or stay on. I have to wait at least 15 minute then try again, sometimes it starts up & sometimes it don't. What can be the problem & how can I go about resolving the problem?

How long has your 1995 Buick Riviera had this problem?

A few months.