1.You have the wrong input (source) selected on your TV
This is extremely common and an easy mistake to make. Most TV’s have several video inputs on the back or side of the TV that are used for connecting different devices such as a cable box, gaming console, and of course, Roku player. You must select the input (sometimes referred to as source) that matches the one to which you have the Roku player connected.
Look to see which input you have the Roku player connected; the video connector will be labelled with the input name; e.g. HDMI 1, HDMI 2, AUX, VIDEO IN 1, etc.
2. The way you change inputs can be different based on the brand of TV and model, but it is usually accessible from a button on the TV's remote control. If you can, check the instructions that came with your television, or try the following:
Look for a button on your TV remote control that says Input, Source, AUX, Video, TV/Video or something similar. Press this button. Depending on your TV, pressing the button may cycle through available inputs, or it may display a menu with a choice of inputs.
If it cycles through the inputs - wait 10 seconds between button presses to allow the TV to detect the video.
If a menu is displayed - use the arrow buttons on the TV remote to choose the right input and then press the Enter or Select Alternatively, select each input one at a time. Wait 10 seconds between each to allow the TV to detect the video.
In both cases, if no video is detected on the input, then the TV will usual show a message such as “No video” or “No signal detected”.
3. The video cable is not connected properly or the cable is faulty
Check that the video cable is firmly connected to the back of your Roku player and to the HDMI or composite connector on the TV. If you have a Roku Streaming Stick, then make sure it is firmly connected to the HDMI connector on your TV.
If you can, check to see if you have a faulty cable by connecting your Roku player with a different cable.
4. There is a problem with the TV
If you can, try connecting the Roku player to a different input on the TV to see if the problem is with connector on the TV.
If you can, try connecting the Roku player to a different television to see if the problem is with your Roku player or the TV.
5. If all else fails…
Disconnect and reconnect all cables including the power cable.
If you are connected to a television or AVR capable of displaying 4K
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