ReadyNAS RND-6A not booting ?

i have just been given an old 6 bay NAS , sticker on the bottom shows as per below.

no drives were in the cases / caddies , i have 2 old 500gb drives i have installed to see if i can get to the GUI . partitions have been deleted before intallation.

Ethernet ports are not showing as being active and i dont see an ip address being assigned on my router.

Front panel shows 

i tried following readyNAS reset instructions , power off , hold reset , power on . it just seems to do nothing . i presume i will need to re load OS or give it a proper reset ,possibly removing cmos battery ? maybe .

any assistance would be greatly appreciated.