Make sure that the blueray is on when you turn on the TV and select that input.
Try a different HDMI input on your TV.
Try a different HDMI cable.
Try the bluray on another TV.
Make sure that the blueray is on when you turn on the TV and select that input.
Try a different HDMI input on your TV.
Try a different HDMI cable.
Try the bluray on another TV.