2012 Nissan Maxima Won't Start

A couple of months ago my Nissan Maxima wouldn't start. I came out of
Walmart & unlocked my car with the fob like normal. I pushed the button to
start & it wouldn't do anything. It wouldn't even switch over to the ON
position. We replaced the car & fob battery at Walmart & it still didn't start.
The lights & door chimes came on as normal but the horn, windows, & radio
won't work. I've tried literally everything from "knocking" on the steering
mechanism to trying the alternate start method with the fob. It's been almost
2 months & it's killing me not to have a car. I can't afford to take it to the
dealership so this forum is honestly my last resort. Thanks in advance