1. Check the power cable to make sure it’s securely connected to the TV and the wall outlet.
2. Check your remote control to make sure it has fresh batteries.
3. Make sure the TV was properly setup with your remote control.
4. On some TV models, a child lock could have been enabled by accident, preventing the physical buttons from functioning.
5. Double-check the user manual or contact the manufacturer’s customer service to work through other troubleshooting steps.