Some helpful resources for chromecast setup. The links are summarized below.
...
- A display device with an HDMI input, for example, a high-definition television (HDTV)
- Access to an available power outlet or an available (non-service) USB port on your HDMI-enabled display
- Access to a secure wireless network (make sure you have the wireless network password handy)
- For Chromecast (1st generation), connection to a Wi-Fi 802.11 b/g/n 2.4G network. For Chromecast, connection to a Wi-Fi 802.11 b/g/n/ac 2.4/5G network (5G is recommended).
- A compatible Android or iOS device or tablet, or Mac, Windows or Chromebook computer (see list below). Note: The compatible Android, iOS, or tablet setup device must support a 5GHz connection in order to set up a Chromecast on a 5GHz connection.Availability and performance of certain features, services and applications are device- and network-dependent and may not be available in all areas; subscription(s) may be required, and additional terms, conditions and/or charges may apply.
What router settings do I need to setup Chromecast?
...
If you are still having problems check out the Chromecast Troubleshooter.