The correct answer is D. Check for loose connections on the display .
According to CompTIA A+ Core 1 220-1201 objectives under Hardware and Display Troubleshooting:
Flickering or strange colored lines on a monitor are often caused by loose or damaged video cable connections (internal or external).
Before considering costly or time-consuming solutions like replacement, the technician should verify that the display cable, internal ribbon cables, or connectors are properly seated.
Why the other options are incorrect:
A. Suggest a secondary monitor: Provides a temporary workaround but does not resolve the underlying hardware issue.
B. Conduct a factory reset: Resets software settings but will not correct physical connection problems that cause flickering or colored lines.
C. Install a screen protector: Does not affect video signal or display functionality; irrelevant for flickering issues.
[References:, CompTIA A+ Core 1 (220-1201) Exam Objectives – Hardware: “Given a scenario, troubleshoot display problems including artifacts, flickering, color issues, and connectivity.” , Mike Meyers’ CompTIA A+ Certification Guide, 13th Edition, Chapter on Display Troubleshooting.]
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