Usually when you add a new router you want to leave both the cable modem and router unplugged for approx 15-20 minutes. Then connect and power on your modem. Once it is powered on for approx 5 min. Connect and power on your router. This should allow it to work.
If not, then you can try cloning your routers mac address as follows:
http://www.belkin.com/us/support-article?articleNum=8250
If not, then you can try cloning your routers mac address as follows:
http://www.belkin.com/us/support-article?articleNum=8250