Got the same problem BUT after trying to update it (if this is the reason that it got kapput then TP sucks ass)
Details: The "main one" is working fine (the one connected to my TD-W8960N router via rg45). The leds of that one work Fine. I press "pair" for 1 second and the Power led blinks for 120 seconds which is what it is supposed to do (to give time to go press on the pair button of the other extender).
PROBLEM; the other extender isn't pairing. WHen I press the pair button, the Power led blinks 3 times, then goes back to steady on. Meanwhile, the Powerline led blinks for 2-3 times in 1 second, breaks for another second and keeps just blinking like that.

I know that the blinking Powerline means that it's transfering data... BUT TO FUCKING what? Tp link really sucks. I'm way better on a chinese generic extender. Paying Brand Price for this piece of crap is Laughable

Oh great, Moderators to approve posts... AKA, Censorship in the forums. Amazing.. go ahead and denie this one too mr moderator