Bought a Asus RT-N16 and i canīt get wifi to work

Tried to factory reset, flashed it but nothing seem to get it started

Radio is on
SSID is on
2,4gHz is not flashing

The only thing i can see is that when i'm at the Network Map i canīt see Wireless MAC-adress. That row is empty
(and when i go to Guest network and turn that on, it tells me to turn on wifi)

Anyone got any idea what i can try to fix it?