The main things to check are connections, battery, starter solenoid, and ignition switch. Check wiring of button in trunk, sounds like maybe someone tried installing a kill switch? Shrug? Start with easiest thing first. All connections to battery terminals, grounds. Check battery, then check solenoid by bridging the two posts with a metal object (screwdriver) as you crank engine, then check ignition switch inside column. If none of that finds the problem then it has to be that button in the trunk. I don't think that would cause your problem. My guess would be ignition switch (common problem) or solenoid. Good luck.