First, the marking board does not require an external dongle. Then check the followings:
1. There is a mismatch between the driver, board, and software. Try changing the software version.
2. Check whether the marking board is genuine and whether its specific model supports the corresponding computer system.
3. After confirming that the laser has been started, check whether the connection between the laser and the board is loose or not in good contact. Or just try another wire.