I have exactly the same issue today. The device has been working without any issue for over 3 months, but today I can't connect to it anymore. First, I noticed I can't connect to it, then, I tried rebooting the system and nothing happens. I then hold down the reset button and still no action. The three LEDs (Power, Disk, and Error) on the bottom is on constantly as well as the NIC1 light when a cable is plugged-in. However, none of the LEDs on the 4 HDs are ON. The drives seem to be spinning up, just no lights. The system does not respond to anything.
I have data I need to recover from the 4 disks. Can anyone help!!! Please!!!