HDMI is a digital interface used to carry video, audio and related signalling between compatible devices. The available features depend on the equipment, ports, cable and negotiated mode throughout the chain. A streaming box's internet connection and its HDMI connection perform different jobs, and either side can cause a viewing problem independently.
A practical example
A box can load menus and receive a programme correctly while a damaged or unsuitable connection to the television causes dropouts. Trying a supported cable or input helps examine that local display path without changing account information or network settings.
A common misunderstanding
A cable's appearance does not reliably describe every supported feature. Match the actual equipment and desired output mode, and avoid assuming that all ports on one television offer identical capabilities.
Related terms
Stable technical definition. Editorial approach