1. Check that the HDMI cord is securely connected to both the television and the other device.
2. On the TV, check that the correct input has been selected for the HDMI port the device is connected to.
3. Try resetting the HDMI port.
4. Check the television’s manual for special requirements for using HDMI.
5. Try using a different device to establish whether the HDMI port is functioning correctly.
6. Reboot the television and the connected device.