220-1201 Practice Question: A technician is troubleshooting a laptop that…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The fan is running at low speed due to a faulty fan controller.

  Why it's wrong here

  A fan running at a consistently low speed due to a faulty controller, while potentially contributing to higher temperatures, is less likely to be the sole cause of a rapid system shutdown compared to a complete failure of heat transfer. If the fan is still spinning, the controller is at least partially functional, and the system's thermal management typically attempts to ramp up fan speed significantly before initiating a critical shutdown. A complete thermal shutdown usually points to a more severe impediment to heat dissipation than just insufficient airflow from a slow fan.

• ✓

  The thermal paste between the CPU and heatsink has dried out.

  Why this is correct

  Dried thermal paste severely compromises the crucial thermal interface between the CPU's integrated heat spreader (IHS) and the heatsink. Its primary function is to fill microscopic air gaps, which are poor heat conductors, ensuring efficient heat transfer. When the paste dries and cracks, these gaps reappear, drastically reducing the heatsink's ability to draw heat away from the CPU, leading to rapid and critical overheating that triggers an immediate system shutdown to prevent permanent damage.

• ✗

  The CPU is faulty and needs replacement.

  Why it's wrong here

  While a faulty CPU can manifest in various system instability issues, including crashes or failure to boot, it is generally less common for a CPU defect itself to directly cause rapid, critical overheating leading to a shutdown. Overheating is primarily a symptom of a failure in the cooling system's ability to dissipate the heat the CPU *normally* generates. A truly faulty CPU might draw excessive power and generate abnormal heat, but a cooling system failure is a more frequent and direct cause of sudden thermal shutdowns.

• ✗

  The BIOS is set to an aggressive power-saving mode.

  Why it's wrong here

  An aggressive power-saving mode in the BIOS or operating system is designed to reduce CPU clock speed and voltage, thereby lowering power consumption and, consequently, heat generation. This mechanism actively works to *reduce* the CPU's temperature and extend battery life, rather than causing it to overheat. Therefore, such a setting would mitigate, not induce, a thermal shutdown, making it an incorrect diagnosis for a laptop that is shutting down due to overheating.

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