If your internet connection is not working after a router replacement, check the following items:

1. Ensure the proper cables are being used. Make sure the power supply is plugged in correctly and the correct cables are plugged into the router and modem.
2. Reboot the router. Unplug the router from the power outlet, wait 30 seconds, and then plug in the router again.
3. Reboot the modem. Unplug the modem from the power outlet, wait 30 seconds, and then plug in the modem again.
4. Verify that wireless is enabled. Make sure that the Wi-Fi light is illuminated, or if the router has a toggle button, ensure that it is turned on.
5. Check for firmware updates. Check the manufacturer’s website for the latest firmware version for your router model and download if necessary.