Blue Blinking LED of Death (Synology)

After a power failure during the night, the Synology NAS didn’t reboot properly. The blue led (power) blinking indefinitely.

see also

# DS215j

# Recovery steps

  1. Power off the NAS and remove all hard drives
  2. Boot the NAS and wait for it to complain about missing hard drives (blinking status LED)

    • The blue led should stop blinking.
    • The NAS should beep indicating a ready step.

    • It has boot with DHCP and has a different IP.
  3. Connect to the NAS via a browser as you would normally do it (you might have to find out the IP using your router or use the Synology Assistant)
  • It should complain about missing hard drives (duh!)
  1. power off (press 4s+ power button)

  2. reconnect drive in same order

  3. Boot

Hoppefully after 1min it was able to boot / everything seams ok. data and config was kept.

Written on December 31, 2018, Last update on November 2, 2025
synology nas