Hi,
I noticed today that my NAS wasn't powered on. I flipped the switch off and back on to try to boot it back up. The NAS power cycled a couple of times then appeared to be booting up normally. It goes though its normal process where all the drive lights blink red then blue and then one at a time they stop blinking red until they are all only blinking blue. Then the drive lights go out and come back on flashing blue rapidly. Drives 3, 2, then 1 all come up normally 5 comes up then It tries 4. It flashes for just a second before the NAS totally reboots and it tries the process again. It looped like this about 3 times before I shut it down.
I've made a video of the lights and what they are doing If you'd like me to post that it may be more helpful than my description.
Thanks.
Edited to correct the light sequence.