Zyxel NSA310 not visible in router/network

I have a strange problem. I have just bought a NSA310 and it seems that it boots up well, namely the sys LED blinks for 20-30 seconds then becomes solid green. The HDD LED is also solid green.

I have tried resetting it by pressing the reset button until I hear one beep.
I have tried resetting it by pressing until I hear two beeps and then three beeps upon releasing the button
The LAN LED's by the socket blink. 

I have tried to connect the NAS to one router and see nothing
I have also connected to a different router and se nothing
Have tried multiple ethernet cables.

I am running win7 and the NAS Seeker doesn't see the NAS. Also when I log into my routers, under dhco clients I see my computer, my android phone but no NAS.

Any possibility to diagnose the problem other than staring at LEDs which are perfectly green and solid? I am getting nuts, my wife gets angry because I an sitting by the NAS for my third day, I am running out of ideas.

Please help me.

#NAS_Sep