Sometimes you can recover with a image file to boot the snap, then reload the OS. Did that several times on my 2000. There is a special reset sequence to clear panic modes.
I would check to see if your cooling fans are still working. Most hardware failures are due to heat.
I think your best bet on recovery is with another 4100. Before you install any drives, connect and verify the unit is in raid 5 and not JBOD. You may have to come up with some drives to do the initial setup if a debug cmd want force it into raid 5. If it was reset back to factory settings, it does not change the drive configuration.