Final answer:
A damaged video display may exhibit a symptom such as a dead pixel, where a dot on the screen does not illuminate any color. Other options like a disconnected punchdown, low RF signal, or a computer booting to Safe Mode are unrelated to display issues. A dead pixel can be identified in a closeup of a screen's individual red, green, and blue pixels.
Step-by-step explanation:
A possible symptom of a damaged video display is a dead pixel. A dead pixel is noticeable when a dot on the screen is permanently off, which means it is black or not illuminating any color. This is a common issue in displays where the pixels do not function correctly due to a variety of reasons, including manufacturing defects or physical damage to the screen.
Comparatively, a disconnected punchdown is a wiring issue in a network cabling system, low RF signal concerns signal strength, typically in wireless communications, and a computer that repeatedly boots to Safe Mode indicates potential software or hardware issues with the computer itself, rather than just the display. In the context of display issues, a closeup of a flat screen that shows the individual pixels which are red, green, and blue in color is relevant because a damaged display might result in one or more of these individual pixels failing to display correctly.