WAN port Unplugged [migrated]

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http://serverfault.com – I have iBall 150M Extreme Wireless N Router. I am trying to connect my internet through this router. I configured it correctly (using quick configuration) as per my knowledge using static IP Address. But When I plugged in WAN cable in to WAN (Blue) Port. It is not showing me LED ON for WAN on Router. I Said I configured it correctly because it worked for me once and then when I switched off my modem and router then it never worked. I plugged same cable in to my Laptop and it is working perfectly. Also, I tried with 2 routers (both are same make and model). I am connected with modem. In R (HowTos)