1. router set-up, WAN connection type = Automatic IP
2. You should power-off the router and cabel modem for a longer time (suggest before sleep).
3. next morning, power on the both router and modem.
Problem should be solved.
Every PC or router has a unique MAC.
I-cable server will remember the MAC address of your original PC. When you dis-connect your PC and connet the router, I-cable will see the change of MAC address and than refuse to send data.