Hello, my name is Dan.
My home is close to Lake Ontario in New York State in the Eastern time zone, I am generally online between 10 AM and 11 PM Eastern standard Time.
If I do not respond right away to your reply, rest assured that I am not ignoring you, I am probably assisting other customers and/or doing research, I will be with you as soon as I can.
Have you tried powering off the modem? All devices must 'handshake' and the extender needs an iIP address which it seems it isn't getting.
The order that I use is: Power everything off, then the farthest away gets power first, let the pretty lights settle and power up the next and so on.
I will look at the device (you gave me enough for that) and you try the above. Let me know if it helps or not.