1998 Chevy Lumina Electrical problem

Electrical problem
1998 Chevy Lumina 6 cyl Wheel Drive Type unknown Automatic 136000 miles

I just had another anti-theft box put in my lumina and my security light came on for about 5 minutes and then it went off today. Every since that security light came on and off, my car will start sometimes and sometimes it wont. Sometimes, if I let it sit for about a minute the car will start. I had my starter and solenoid replaced in 1-07. I was told that my car would make a clicking noise if the starter was bad and I try to start the car up. I had the battery and the alternator tested and they both came back good. My step-father, who works on cars, said that I might might have to hit the reset button some where in my car. Do you know what can possibly be the problem and do you know where I can find the reset button on my 98 chevy lumina?