Searching for that phrase brings up a previous discussion here:
And a description without a solution:
https://forum.laseruser.com/viewtopic.php?t=6176
Because the controller attempts to home the machine and the motors move, the low voltage (probably 24 VDC) power supply is working.
The collection of symptoms suggests the HV power supply failed, perhaps by arcing to the frame and limit switch wiring, which then damaged the controller.
You can test the HV supply by unplugging the (typically green) connector with the wires from the controller, then pressing the TEST button on the supply. If the laser fires, then the supply is at least functional, although the control inputs may be damaged.
Because the controller is not responding to the buttons on its display, it’s probably damaged beyond repair.
Unfortunately, the smallest replaceable units are the controller and the HV power supply, because neither can be repaired.