Check the connection. 2. Power cycle Chromecast. 3. Verify the HDMI input on the TV. 4. Make sure the Chromecast and the casting device are on the same Wi-Fi. 5. Restart the casting device. 6. Update Chromecast firmware via Google Home app. 7. Reset Chromecast if necessary. 8. Minimize interference (move devices closer, minimize obstructions). 9. Test on another TV or display. If the problem persists, contact Google Support or consider replacing the Chromecast.