If a purple screen appears on your television that says “HDCP unauthorized content disabled” this usually is because of a loose HDMI connector or a problematic HDMI cable.
To correct this problem, try the following steps:
If the problem persists, try with a different HDMI cable. This is in order to guarantee the cable you are using is not faulty, if it is, you can simply change the cable and use a new one.
Note: If this is the first time you observe the purple HDCP screen after setting up your Roku player, it is possible that your television is not compatible with HDCP through HDMI. In most cases this is true for older TV sets that comply with initial HDMI protocols that do not implement current standards. To obtain more information about your television and what it is equipped to do, read the user manual or contact the manufacturer.