Might check the power adapter and voltage and amps on the tip to see if they match whats on the sticker.
Factory reset should be done with the drives in. The factory reset will not remove any data on the drives. It just resets the user configurations in the UI is all.
If you connect the DNS to the main host router, is it getting an IP address from the router? Check the routers connected clients table to see. If it's getting an IP address, try to log into this IP address in IE11 or FF.