1. Check the power cord to make sure it is securely plugged in and the power source is on.
2. Check all of the video and audio connections to make sure they are securely connected.
3. Check to make sure the TV input is set to the correct channel.
4. Try unplugging the TV for 30 seconds and plugging it back in.
5. If all of the connections and settings are correct, consider resetting the TV.