I have a DSL modem and a DI-604 4-port router. I am currently running 2 PC's on the router with no problems (in the past I have run 1 PC and 2 laptops, also w/ no problems). However, now I am trying to connect a totally different laptop to the router and it just will not work. I know the router is working fine, and when i connect the laptop to the modem itself, it connects to the internet just fine. I've tried just about everything I can think of...the network settings for the laptop are identical to that of the 2 PC's that are working. When I try to run IPCONFIG, it says there is no cable connected. The little network connection icon at the bottom of the screen constantly toggles back and forth between "10 Mbps connection", "Network Cable Unplugged", and "100 Mbps." Any suggestions?