ReadyNAS RN4220 wont boot up after shutdown from WebUI

Hello,

Thank you both for your replies i really appreciate the help. 

Update based on testing:

I looked at the video card route but i am only used to PCIE slots (Zoomer, i know) and unsure what card would even fit on this custom MOBO?

The RAM is indeed 2x4GB DDR3 1600 ECC.

I have tried using just 1 stick in the white slot closest to CPU, and the behavior is different. The server will boot and  turn off within 5-10 seconds. After a few more seconds it will attempt to boot again by itself, repeating the same behavior indefinitely (boot loop). This happens with either stick of RAM in any slot solo. When both sticks are in any permutation it goes back to original behavior of just sitting there with a blinking power light.

Assume it might be a RAM issue but will take like a week to get DDR3 EEC (Never used EEC RAM before!). Assume any speed is OK or will the server reject anything higher? Trying to find something that fits those exact specs in Aus has been a bit annoying (its either 1600 or ECC never both, assume ECC is more important!)

PC3L looks like a low powered option of DDR3, would that help prevent this in future? Something like: Samsung 16GB (4 x 4GB) PC3L-10600R REG ECC RAM M393B5270DH0-YH9

or would it be rejected as its not the same as the shipped RAM?

After you confirm, I will get 4 new RAM sticks by Friday probably and check in next weekend with results, if it fails i will look into a new NAS as if its a capacitor or something that is blown i am unprepared and unwilling to start fault finding shorts and soldering on new components.

I have 2x Raid5 volumes, each being about 5*18TB drives. So im using 10 Drives total out of 12 on the NAS, with one being a Free Drive, and one slot not working (came that way, assume damaged connector, if you push it hard the green lights up but then drops when you stop pushing, not stressed about that too much as 10 is enough for me).

So i can just dump the 5 from the main volume into another OS6 NAS and it will work? The problem is i am like 75% sure what order i put them in but not 100% as the with the 1 missing slot being in the middle i either went up down or left right, any easy way to tell without bricking the drives? I do have an external SATA to USB cable + power i can use to read the drives manually on my PC easily.

Thank you both again for all the help!