You had a power outage and now things don't work. The first thing you should do is test the output from the power brick (they can and do fail under a power surge). Ideally you should test under load to see that it is supplying correct voltage and Amperage (12v @ 3A). If it does not supply that voltage under load there is no way the disks will spin up.
The voltage is correct and adequate. I have four (4) 320Ls mounted on the same dedicated 20amp circuit. Two of them are model A2s with 1.00 firmware. The other two are model A3's with 1.02 firmware. I also have two new A3's not yet in service. The two A3's that are in service powered right up after the power outage. The two A2's did not. After 24 hours, they remain unable to power up the hard drives. I have switched AC adaptors, etc. and the A3's power up with the same adaptors that the A2s were on.
To answer your second question. It depends on two things, 1) how the disks were setup (which RAID, JBOD or Single disk). RAID 1 and Single disks might work if 2) the NAS should be of the same model number and series with, preferably, the same firmware.
All of my "in service" 320Ls are two disks each, RAID1 configuration. Unfortunately, the only two A2's I have are the two that no longer function properly because of the outage. All of my other 320Ls (including two new spares) are A3's with 1.02 firmware. I gather then that a disk formated under an A2 with firmware 1.00 will not function in a new case with A3 and firmware 1.02, correct?
If you don't have those conditions then you need to read the Recovery sticky at the beginning of this forum and make a backup of your data. You can then format the disks in the new unit and restore from that backup.
I attempted to try the Ext2IfS executable in "read only" mode. That didn't work, as there's some kind of "incompat" flag set on the drive that the Ext2IfS module can't support (which I discovered by running the "mountdiag.exe" executable) . Apparently, the only way to resolve it now is to have the drive be read by a Linux based machine. This means I'll have to build one (don't have one presently). That's Ok, since I may very well migrate to Linux/Ubuntu after WIN7 EOL (did not go with WIn8 or Win10).
If there's anything else I can try, I'm happy to listen. Otherwise, it looks like I'll be building a Linux box over the next day or two.
One other question. Is the problem of the faulty temp. sensor resolved in the A3 models of 320L? If so, then I can easily migrate to them, once I recover the data on my 2 A2s that aren't working.
Thanks.