1999 Buick Regal My car will not start

I was driving my car home when all of a sudden all the warning lights in the dash came on flickered and stayed on for a second and then went off, I didn't understand why that happened so I just brushed it off, but when I drove about a mile down the road it happened again and the car liked stalled out I had to put the car in park turn it off and restart it, I made it home but had to go back a out when I went to start the car It wouldn't start at all I tried several times. My father in-law check the battery, the starter, all the fuses, and realy's, there all fine, he thought it was the pcm, I replaced that and it still didn't work, I don't know what else to do especially since I'm mechanically inclined, I've been searching online some people have been having the same problem I'm currently having and they said It has something to do with the ignition switch I hope that is what it is, can anyone help me out this car is my life line where I live at I need a car to get around