Here are some methods for troubleshooting:
a). Please unplug the Ethernet cable from system, then restart the system without Ethernet cable to have a try.
b). If still not working, 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.
While the system comes back, Kindly please change the password for your system, it seems the hack attract your device, Please make the password a little complex. don't easy as empty