ReadyNas Pro died

The most likely culprit is the power supply, unless it was badly dropped or something. Maybe something just came loose, but they are put together pretty well, so that's unlikely. A standard ATX supply can be rigged up externally to see if that's the problem. It's jus a straight plug-in to the appropriate connections. If it is, see other threads in the forum about replacing it with an SFX form factor supply. Or, just use the external to power it up till you transfer the data to a new NAS. While you are messing around with it, I recommend you remove the array drives and put in a single "filler". No sense putting your data at more risk till you know what the problem is. I've replaced the supply in two of the older Pro units.

The array is probably intact. No way to know for sure until you put it in a working system. It has been posted that Netgear support can help you recover the data via one of the newer models, but you are still going to have to back it up, re-format, then put it all back on to get full use out of it.

Assuming you have all 6 slots full, any of the Pro or Ultra 6-bay units should work to put your drives in and have it just come up and work. It is best to be sure that that system has the same RIADiator version in it, though. If you have 4 or fewer bays filled, then any of the x86 based 4-drive units should also work.