RND4000v2 (ReadyNAS NV+ v2) RND-48 won't turn on after power cut

jns_johnson wrote:

The LED display and power button lights up for around 1 second when I connect the power cable but then nothing more.

 

The power block shows a green light. I've tried the reset button at the back (30 seconds with power connected) and also tried to remove all 4 drives but always the same result.

30 seconds was very risky.  You could easily have initiated a factory reset, which would have deleted your data.

It is possible (despite the green light) that the power brick has failed.  So you could do a risk-buy of a compatible adapter.  There isn't much else you can do with the v2 - the RAM is soldered on, so there aren't any internal components that are user-replaceable.

As far as replacement goes, you'd have to get used NV+ v2 - nothing else is compatible.  Anything you purchase would be at least 12 year old, as Netgear stopped manufacturing the v2 in 2013.  Also, the labeling is confusing, so you need to be very careful that you get a v2.  The v1 is not compatible.

The other option is to get a 4-bay USB enclosure, and connect it to a Windows PC.  Then get RAID recovery sofware -https://www.r-studio.com/ is one of several packages that will work.   If you take this path, you wil need to offload your data to other storage.