Hi, me also have the same problem.
LAN LEDs + WAN are steady ON. Power+AIR off.

My power supply is OK, tried with big PSU 5V/8A and also my router is not functional (same LEDs steady).
I cannot ping it from computer, restore button in back is doing nothing.
Also tried to start restore mode (power off, push restore button and plug power on) but it does nothing.

Any ideas??

Thank you