What's causing my car not to start?

What is your question?

I know I have an after market alarm that started bugging out on me. i manually disabled it. A week later when I would drive and put on my blinkers. I could hear a buzzing noise acoming from the dash nd the battery light would come on along with the passenger seat belt picture(with no one in the passenger seat). A week later i drive to work. On my break I tried to drive my car but it didn't start. It doesn't make a noise or anything when I turn the switch.