In most cases, this might be caused by an untriggered limit switch. Troubleshoot by the steps below.

1. Remove the glass cover on the left side of the engraver.
2. Remove the metal plate on top of the main board.
3. Check the status of LED1 and LED3 on the main board.

Under normal circumstances, LED1 and LED3 will light up when the laser head returns to its origin along the X and Y axes, go out, light up again, and finally go out.

If LED1 (or LED3) is always off, the limit switch might not have been triggered. You can test it with a magnet to ensure the problem. If the LED indicator lights up when the magnet is closed, adjust the magnet position of the machine. If not, replace the limit switch.