No LED is on, including the power button. What should I do?

If no LED light is on, including the power button, please check the following points:

1. Is the power supply connected to a live electrical wall socket?
2. Is the power supply an Evolis one?
3. Is the power supply faulty? (The power supply displays a green light when it operates properly).
4. Is the power supply suitably connected to the printer?