First, will the remote turn the TV on and off? If you have a universal remote that controls the TV and other devices, a button may have been inadvertently pushed for a cable box or something else. Make sure you push the TV button and then turn the TV on. If you still can't get the menu to come up you have a more serious problem. If you can get the menu then you need to set your input (air, cable, sat, etc.) and scan for channels. If using an antenna (like we do) you will normally set your input to air or antenna (not cable as someone suggested).