Z-axis moves in one direction

I have tested the motor and it is fine. Despite what g code I push to it, it will only move one way. I am using a RAMPS 1.4 with an Arduino Mega 2560. The stepper drivers are standard A4988. I have flashed it with Marlin 2.0 firmware. I have been working on this project for a week and I don't know what to do. This is not for a 3d printer, but a robotic arm. I've been told it is the end-stops causing it, but I don't know why or how. Here are my current settings:

[docs.google.com]

send the printer a M119

any endstops that say triggered, you cannot cant move n that direction...

failing that run the ramps basic test firmware [reprap.org]
it blindly moves all axis and turn mosfets on and off. if this doesn't move the axis, the board has a fault

Edited 1 time(s). Last edit at 02/09/2020 10:41PM by Dust.