RND4000 Stuck booting; 4, 2TB disks installed; all disk drive LEDs off; power supply fan is running

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gregoryrhill wrote:

and the front simply says, "Netgear ReadyNAS NV+".

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Ok, that means it's a v1. 

-You can migrate disks directly to another v1 platform (NV, NV+, or an RN1100 rack mount).  If you decide a risk-buy an older used model, then perhaps focus on the NV+.  Then if the used unit is faulty, you could still try to use it for parts (swapping the memory or the PSU with your original).  Be very careful to get another v1.

-Another option is to purchase a new OS 6 readynas, and pay Netgear to mount your NV+ temporarily to let you offload data.  That might cost $200 if they decide they need to charge you for the data recovery service.

https://kb.netgear.com/29876/ReadyNAS-Migrating-disks-from-RAIDiator-4-1-or-RAIDiator-5-3-to-ReadyNAS-OS-6

https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service

-If you can connect all the disks to a Windows PC, you can try recovering the data.  Folks have reported success with ReclaiMe, but you could try R-studio for Linux first (it's considerably cheaper).  You can download both and try them before purchase (though you can't actually recover data unless you buy the software). 

https://www.r-studio.com/data_recovery_linux/

https://www.reclaime.com/

-If you are skilled with Linux, you could also boot up the PC using a Linux "live" disk, and then attempt to mount the RAID array manually from the linux command line.  That would be free, but requires more technical skill than the other options.