The problem might be with any of the following:

• • Main power cable
  • Wall socket 
  • EMI  filter 
  • Emergency stop 
  • 5V power  supply

• Remove the cover of the control box.
• Check the input voltage of the 5V power supply. If you are getting a reading and the indicator light on the power supply is not lit, replace the 5V power supply with a new, identical one.

• If you are getting no reading, go on to check the input and output voltage of the EMI filter.

• If you are getting an input reading and no output reading, replace the EMI filter with a new, identical one. 
• If you are getting an input reading and an output reading, replace the emergency stop with a new, identical one.
• If no input reading can be read, check whether the wall socket that the machine is connected to has power.