|Sounds like you're using ICS (internet connection service) at the ORIGINAL laptop and the other laptops are connecting to the internet through the ORIGINAL laptop.|
Let the router establish the connection to the internet.
Also turn on DHCP service in the routers setup.
Configure all laptops to get ip address and DNS server automatically via DHCP.
The laptops should get an ip address of the range 192.168.x.x automatically and should be able to surf the internet, even if the ORIGINAL laptop is powered off.
Click Here on HowTo ask good Question to get best Help
Let us know, if the problem is solved !!!