Need help connecting to new modem

start the modem, let it boot up, connect the modem to the router through the internet (wan) port. Not sure if you've reset your router but try it and see if it detects the modem without resetting, otherwise reset it and connect your computer to the router to run the system wizard for the setup after the modem has booted up. Remember the modem will marry your router once its booted up and every time you need to restart your router you will have to restart your modem most likely.