Make sure you are using the correct boot-up procedures as follows.

1. Plug in the power cord and make sure the plug is plugged into the bottom with no loose contact.
2. Flip the rocker switch to on.
3. Turn the emergency switch up front clockwise.
4. Check whether the engraver is responsive. Under normal circumstances, the engraver's LED light band lights up, the laser head moves to the mechanical origin, and the water pump begins to work following the completion of normal boot-up procedures.

If the engraver remains non-responsive, check whether the rocker switch lights up or not. 

• If not, check the fuse in the socket(as shown), and replace it with a new one if it is blown. 

• If the rocker switch lights up, then open the cover of the power supplies and check the status of them (refer to the video).

        Check whether the power supplies' indicators light up or not (as shown).

• If these two indicators do not light up, the rocker is defective. Please replace it.
• If one of the power supplies' indicators doesn't light up, replace the power supply.