Readynas Duo RND2000 v2 Problems.

So, recently (about a month ago) a customeer had a power outage, their ReadyNAS stopped working and I got it handed to me too have a look at. I've been having nothing but troubles with it tho. At first it blinked in a sequence of 5/3 iirc, I then swapped out the memory card to another and it seemed to have solved the issue I've had. Woho I thought, but no. I can see it fine in RAIDar when there is no disks in it. But as soon as I've installed a disk it just doesnt show up. So I figured I'd try and factory reset it, followed the guides for it and got nothing, I did get a solid led light on disk2 led and nothing more when holding reset pressed for too long. I also tried to USB boot it with the sparc firmware (seems to be the one I'm supposed to use?) I'm currently at a loss of what to do. Any insight or ideas on what to do would be great. I'm basically tossing a live grenade and hoping for a mental explosion to do its magic. ;)

Tried:
USB Boot with Sparc image.
Factory Default / OS Reinstall / Menu loading (none worked afaik)
Swapped Memory
Swapped Battery (not mentioned in the text but still done)
Tested an array of disks. Mostly Western Digital of different flavours that we know works.

Also, as a sidenote, this is the second readyNAS duo V2 we've got that does this exact same thing.