For most situations, check the following:
- Make sure your video cable is firmly connected to the back of your Roku player and to the back of your TV and/or receiver.
- Make sure you Streaming Stick is connected firmly into the HDMI® input of your TV or receiver.
- Make sure that your TV or receiver is tuned to the correct input. (It's usually a button on your TV remote labeled "Source", "Input", "Video" or something similar.)
- Make sure your Roku AC adapter is plugged into a working power outlet and is firmly plugged into the Roku player.