What should you check if a set-back box (SBB) is experiencing a black or blue screen?

When troubleshooting a set-back box (SBB) that is displaying a black or blue screen, checking that all cords are installed correctly is crucial because a poor connection can prevent the SBB from effectively transmitting signals to the television. If connection cables such as HDMI, power cords, or coaxial cables are loose or improperly connected, it can lead to display issues like a black or blue screen. Properly confirming that all connections are secure ensures that the device has the necessary power and signal to function properly, which is essential for resolving the issue.

In this context, while verifying internet connectivity could be important for internet-based services or streaming, it does not directly address display problems from the SBB to the television. Inspecting remote control batteries is relevant for operational issues but unlikely to impact video display. Ensuring the TV is on the correct volume is not related at all since the volume control does not affect the visual output of the device.