Apple TV (3rd generation) will not connect to my WiFi since new modem installed

1. Try the steps as mentioned in: If your Apple TV can't connect to Wi-Fi - Apple Support
2. Try the ‘Other…’ option instead of selecting a listed discovered network. Especially if the password has been changed for an unchanged network name.
3. For Apple TV (4th generation or earlier), verify that the router or access point isn’t set to use WPA3, as only device models from ~2018 or later support that. Instead use ‘WPA2/WPA3 Transitional’. Some users report that they had to set ‘WPA2’-only first.

Please unplug the Apple TV from its. power source for 2-3 minutes, plug it back in and attempt to connect to the network.