ReadyNas RND4000 NV+ V2 stuck booting

I have a ReadyNas RND4000-200NAS NV+ V2 which has 4 disks (2x3TB Seagate NAS Drive, 2x750GB Seagate drives) and was configured using XRaid I believe. The NAS was running the most recent version of Radiator (5.3 or something like that). I had it working up until yesterday when I was told the NAS no longer was displaying as available over the network. I instructed the user to reboot the NAS and test again. The NAS appeared to work, and when I got home, it was in a booting phase that did not seem to stop. The disks were warm, but not spooled up. None of the disk lights were lit, the act light flashing rapidly, and the LCD panel showed "Booting..."

Thinking my drives might have failed, I removed all drives and restarted the device (unplug, power button would not shut it down no matter how long I held it). When I was able to power it back on, the drive lights never came on, the act light blinked rapidly, it went into Booting... again, then relayed "Error: no disks detected". I attempted hotplug and cold plug of drives, and the reboots were hit or miss with being able to reach the error again (maybe 50% of the time it just stayed in "Booting...". 

So I searched the forums. I did the battery trick, I tried to boot into several recover modes, all of which give me either the perpetual "Booting..." message or the "Error: no disks detected". I tried to boot from flash with a recovery USB by holding down the backup button, but the LCD gave no indication this mode was active, and the backup button only flashed quickly like the activity light. I let it run for 20 minutes like was recommended and still had no luck. If I boot into the boot menu, I've tried normal mode, disk test, tech support, the memory test is fine, nothing seems to work.

So the bleeding heart part: I have a backup of my pictures in the cloud, thank God, but all of our data (taxes, w-2s, old home movies) which weren't backed up somewhere else. I know, I'm an IT guy and I should run a robust backup. I get it, so keep the unnecessary judgment as we've all made some mistakes in our lives, so let me wallow in mine of my own accord, thank you.

All I'm wondering is if I missed something, a step somewhere I didn't follow or maybe if the raided drives could be readable via another ReadyNAS. Or better yet, as the disks were not anything but a JBOD due to using all four for the raid (1 3TB and 1 750 for recovery), could I possibly pull the data from a disk or mount them in a JBOD capable machine? It all sounds too farfetched, but I owe it to my family to try each avenue if possible.

Edit: One last note I failed to mention in my rant. I hear an electrical noise coming from the top of the readynas itself when powered on. When the disks are in, the electrical squealing sounds like something spooling up, but it is most definitely not the disks. The noise continues without disks as well. Last item, I tried with multiple drive configurations: 0 drives, 1 drive, 2 matching, 3 drives, all drives, one drive of each size - none worked.

Edit Edit: I also tried with a scratch disk, never got past Booting... and the disk lights never came up. I opened Raidar and saw that the nas would populate sometimes. It would populate in Raidar, but wouldn't show anything aside from MAC. No disks listed even when I put the disks in via hot plug (disks did spin after error displayed on screen of no disks). When I would try to rescan, it was unavailable for another minute before becoming available again.