When the Raspberry Pi is connected to the TV by an HDMI cable you will need to select the input on your TV. On mine I press the AV button on the TV and then select the HDMI 1 input as this was the one I plugged the HDMI cable into on the back of the TV.
When the Raspberry Pi is connected to the TV by an HDMI cable you will need to select the input on your TV. On mine I press the AV button on the TV and then select the HDMI 1 input as this was the one I plugged the HDMI cable into on the back of the TV.