Homing sequence works but not wiring test

HELP! Im new to all this. I run the wiring test thru easel. sometimes x works, sometimes y works, sometimes both work. never get z to work. once i hit a z arrow x and y arrows don’t work. i continue to start homing sequence and x, y and z all move. Any help would be greatly appreciated as my frustration level is thru the roof.

Check all of your wiring connections and make sure they are clean and tight.

Don’t assume they are OK - turn the screws…