The steady blue light that does not blink or change color in response to the reset button or a power cycle seems to be a fault condition.
The manual states to hold the reset for 10+ seconds. Nothing happens.
Elsewhere on the web people describe needing to give it more time, but those suggestions are in response to a unit rebooting - my constant blue light system does not reboot or change in any way when the reset buttons is hit.
I notice the blue light is slightly less bright than a working node - so I tried a different , known working power supplies with no change.
Finally, the unresponsive unit does not broadcast any SSID, and when connected via Ethernet, does not register.
I think it is dead, Jim.