@fnola: After I installed Hajos Debian for my NAS 110 and added the data Partition to fstab (to get automounted at boot), after some reboots I had the same behaviour like you, the leds blinked for like 6 minutes, I though the system is broken now, I restarted it multiple times,always same behaviour, reset button didnt help me too.
Then I let it do the blinking for like 1 hour and when I came back it was working again, maybe it was checking file system or creating/checking the raid array.
If you have the 2TB Version (with 2 disk) or even more like 3 or 4 tb,it could take even longer.
Important: While the LED is blinking blue, you should hear the disk making noise a bit (means read and write is done on the disk) like I did.
If it doesnt came back to live after some hours of blinking, you could make use of your warranty, but if you installed another OS or did some othere some software changes I think the warranty would be broken, if you want to get the firmware reinstalled, you would need to open your NAS and get the disk and erase all contents, when it gets inserted again, the default firmware will be installed, there are some tutorials about this here in the forum.
