I have a problem with running my montero on 1998 Mitsubishi Montero

I have replaced the switch blinkers because my old blinkers was on left turn signal the whole time. When I try to reset it to normal, it is on the left blinker still so I bought a new switch blinker. I have driven it once at work and had no problem. The next day, my car would not start. I have stopped ever since. Today, I went to Autozone and checked if the battery is okay and they said that its okay. Now, I jump start the car again. When I turned it off and back on, it would not start again.

Asked by for the 1998 Mitsubishi Montero