DRAM Test Fail A0000000 - RAM or other fault?

Hi all,

I would like to ask you for advice, as I've had very successful and excellent support from the community before :) I finally bought a backup 8Tb disk to backup my ReadyNAS NV+ (the old v1).

The irony is, a few days ago we had a power cut, and when I tried to start it up again, it's stuck on "Booting, Please wait ...", and the blue power button flashing about 2-2.5 times a second.

The 4 disk LEDs never light up. I can ping the NAS but can't access it in any way. Connection refused via ssh for example. I left it for ~2 days with no results.

I tried booting without any disks and/or skipping the volume check, same problem. The disks are all new WD Red series - about ~6 months old and barely used. I highly doubt anything is wrong with them.

I noticed this happened once before ~2 months ago with the unit just hanging and not being accessible, but rebooting it once or twice it booted up properly.. That's when I decided to get the new external drive to backup.

Now.. Before trying an OS reinstall I did a memory test, and that failed :( 

"DRAM Test Fail    A0000000"   (A with 7 zeros next to it). And LEDs 1+2 light up, then 3+4, and it repeats.

So, my question is, does anyone know what that A0000000 code means? I'm trying to deduce if it's an actual memory fault - to which I can just buy a new stick from Amazon like this one - or if it's more serious problem with the NAS / Board ?