Here are some methods for troubleshooting:
a). Please unplug the Ethernet cable from system, then restart the system without Ethernet cable.
b). Please remove the hard drive from system, then power on the system separately to have a try.
c). If still not working please, use another power supply (with same voltage) for the system to have a try.
If the problem is not solved, please send email to firstname.lastname@example.org. The technician will help further.