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As Zeph says, you need to unplug the USB wires. You must alsow switch off the power to the modem, router and and computers. Then you can connect the ethernet cable between the router and the modem. Now connect the ethernet cable between the router and any computers, or alternatively use wireless. Only once you have changed the connections over (and the modem has been off for a few minutes), should you power on the modem, let that settle down, then power on the router, let that settle, and finally power on any computers.
It can be easier to establish a connection and setup initially between the modem > router > computer by using all ethernet setup, before swapping from ethernet to wirless between the router and computer(s).
---------- Post added at 01:53 ---------- Previous post was at 01:51 ----------
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