The correct answer is B. Replacing the fans .
According to CompTIA A+ Core 1 220-1201 objectives under Hardware and Troubleshooting:
A computer that gradually slows down and then shuts down without warning is often experiencing overheating .
Overheating can occur when cooling fans fail or dust accumulates, preventing proper airflow. Replacing or cleaning fans restores cooling and prevents thermal shutdowns.
Why the other options are incorrect:
A. Upgrading the memory: Would improve system performance if there is insufficient RAM but does not prevent thermal shutdowns caused by overheating.
C. Adding drive space: Helps with storage capacity but does not affect CPU/GPU heat or thermal shutdown.
D. Swapping the power supply: Would address power delivery issues, but the scenario describes gradual slowdown before shutdown, which is characteristic of thermal issues rather than immediate power failure.
[References:, CompTIA A+ Core 1 (220-1201) Exam Objectives – Hardware: “Given a scenario, troubleshoot PC issues including overheating, thermal shutdown, and component failures.” , Mike Meyers’ CompTIA A+ Certification Guide, 13th Edition, Chapter on Troubleshooting Hardware and Cooling Systems.]
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