What is a best practice in troubleshooting an AV system?

Re-testing after each change is a vital best practice in troubleshooting an AV system because it allows for a systematic approach to identifying and isolating issues. By making one change at a time and observing the impact, you can determine if that specific change resolves the problem or introduces new issues. This methodical process not only enhances the efficiency of troubleshooting but also builds a clearer understanding of the behavior of the equipment involved.

In contrast, randomly pushing buttons could lead to confusion and complicate the troubleshooting process, as it does not follow a structured approach. Resetting configuration files to default may erase important settings and lead to additional work restoring the system to a desired state. Lastly, disabling all user features may not effectively identify the root cause of the issue and could hinder the system's functionality, preventing you from assessing what is actually causing the problem.