Be absolutely certain there are no loose wires. Those rarely (if ever) fail.
I highly suspect this is solvable if you root out what is loose.
It’s that part on page 5 of this schematic: https://www.avidcnc.com/support/instructions/electronics/ex/manual/pdf/schematics/24.1/CRP5210-00-ELEC_24.1.PDF
This part is a contactor that closes the circuit to feed power to those power supplies.