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Difficulty: MediumVideo, Display, and Projector Issues

A desktop workstation connected to an external LCD monitor exhibits persistent visual artifacts and horizontal line distortion across the display screen. A technician takes a full-screen screenshot using the operating system's software screenshot utility and opens the saved image file on a known-good secondary computer. The captured image appears completely clear with no distortion or artifacts. Which of the following are the MOST likely causes of this display issue? (Select TWO.)

  1. A loose, damaged, or improperly shielded video signal cableAnswer
  2. A failing physical display panel or internal monitor scalar boardAnswer
  3. C
    Corrupted or outdated graphics adapter display drivers
  4. D
    Overheating VRAM or failing GPU processing hardware

Answer

The most likely causes are a loose, damaged, or improperly shielded video signal cable, and a failing physical display panel or internal monitor scalar board.
Taking a software screenshot isolates rendering components (GPU, VRAM, and display drivers) from physical display hardware. When the saved screenshot is artifact-free, it proves that the graphics frame buffer contains uncorrupted data. Therefore, the visual distortion must be introduced downstream in the physical path—specifically by a loose or damaged video cable, or a defective monitor/internal display board.

Step-by-Step Solution

1
Analyze the result of the software screenshot diagnostic test.
The screenshot image file is clear of visual artifacts when viewed on another device. This confirms that the operating system, graphics driver, GPU rendering engine, and VRAM frame buffer are working correctly.
Software screenshots capture the image directly from the frame buffer in memory before it is transmitted over physical video cabling.
2
Identify potential hardware failures located downstream of the frame buffer.
The fault must lie in the physical hardware components responsible for transmitting or receiving the video signal.
Downstream hardware includes the video output connector, the physical display cable (HDMI/DisplayPort), and the monitor's internal processing circuitry/panel.

Key Concept

Screenshot Diagnostic Test for Display Troubleshooting
Estimated Time:1m 30s
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Topics

Video, Display, and Projector Issues

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