I haven’t connected the drive to the PC for a few months but when I did it showed a red light and makes noises like the old modems used to make.
I have tried a different port on the router, a different cable and connecting it directly to the PC without luck. The lower LED on the rear shows permanently green whilst the upper LED flashes.
The PC has been updated to Windows 10 in the time since the MBL was last on.
If it is a hd failure, then you can replace the disk and put a new disk in the MBL case. It’s a bit complicated, but it is possible. essentially, you use the debrick guide found on this form. There is section of the guide for installing new clean disks, that’s what you want. You must replace the disk with the same make and model - WD Caviar Green. The size can be different though.
I’d suggest that you take teh existing disk out of the MBL and connect it via USB-Sata cable to your computer to see if your computer can read it. You will need a Linux computer or at least some software that allows your computer to read Linux ext3 formated disks.