Often faults on this nature can be caused by the Power unit either not working or a short that shut the supply down.
The first thing I would check is measure the 5v or 24vdc out of the P.S. when powering up, if it comes up briefly, remove the 24vdc connections one at a time and see if the unit stays powered, if it does, it then track the source of the short on that conductor.
Do the same with the 5vdc.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.