Make sure you can see the router from a computer hooked up to the switch. There is usually some IP that they have you enter in the site address bar in a browser so you can configure the router. Also, you wanna make sure you are not specifying an IP on the comps you are using the router for. If you can't see the router from the comp hooked up to the switch, unhook it from the switch and plug the same comp and cable into the router. If you can see the router when hooked up like that, your switch may be bad... and you may wanna try a different switch to make sure.