ReadyNAS RND4000 v3 - Power on (fan noise), top row of LED flickers, no display, no network presence

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Raj_UK wrote:

I've googled and seen people say that if it doesn't do anything at all it could be the power supply, but if it does spin up the fans and the LED's do flicker for a moment (nothing on the main display though) then is the PSU OK and it's something else ?Raj

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Those "several people" don't know what they are talking about.  There are multiple power busses on the supply, and problems can affect all (as "several people" seem to think is the only possibility) or just one.  Your symptom is consistent with a properly functioning 12V (on which the fans run) but a bad 5 or 3.3 V (on which the logic runs).  Of course, there can be otrher issues with the logic than just the power.  But the power supply is a typical first failure in a NAS (just because people keep them longer than they typically do a PC, not because of a design issue), so testing that is a good start.  The adapter cable StephenB suggested is a good way to do that.

Of course, the NV+ is old & slow, only supports 2TB drives max, and is limited to SMB1.  So it may just be time to set the old one aside and go for a new one.  Unfortunately, sources seem to be pretty limited right now due to COVID-related supply channel issues.