Wich Router type (Model) do you have?

Usually on the bottom or back of the router there is  a label with the name of the device.

Hello, when encountering connection issues after a power outage, it is often recommended to reboot the router. If the problem persists, ensuring that settings are correctly configured such as MAC addresses, DHCP server settings, and IP address corrections might help. This is especially important if you have a network setup involving repeaters, where configurations need to be very precise. ^Khaled