1. Check to ensure that the device has the most current firmware version installed.
2. Check to ensure that all cables are securely connected.
3. Reboot the device.
4. Try using a different source (or a different HDMI cable if connecting directly to an HDMI-input television) to make sure that the initial source isn’t the issue.
5. Unplug all HDMI cables from all devices, wait 10 seconds, re-plug the HDMI cables and try again.
6. If possible, try connecting the device to a different TV.