ASUS RT-AC87U - not working. is it bricked?

Hi,
My Asus router is not working. When I plug in the power cable, only 4 LED (WAN, LAN 2, 3 4) are turned on and doesn't blink. None of the LAN port are working nor WAN. Power button LED doesn't turn on. WIFI also same problem.
What could be the possible problem?