If a set-top box does not respond to the remote control, what is the first step to take?

When troubleshooting why a set-top box is not responding to its remote control, the first and most sensible step is to check the line of sight between the remote and the box. This is essential because infrared remote controls require a clear path to communicate with the receiving sensor on the set-top box. Any obstruction, such as furniture or other devices, can block the signal, rendering the remote ineffective.

Commencing the troubleshooting process with the line of sight ensures that you eliminate this common issue before proceeding to more complicated solutions. If the line of sight is clear and unobstructed, you can then move on to check the batteries in the remote or consider the other options, as they would be relevant only if the direct visual connection is not the source of the problem.