The answer is dried-out thermal paste. When a laptop shuts down randomly with high CPU temperature and a fan that is spinning normally, the core issue is poor heat transfer from the processor to the heatsink, which is almost always caused by degraded thermal paste. The fan working and vents being clear rule out airflow obstructions, so the heat is trapped at the CPU die itself, triggering thermal throttling and an emergency shutdown. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of thermal management and the difference between active cooling (fan) and passive heat conduction (paste). A common trap is assuming a spinning fan means cooling is fine, but the paste is the critical bridge. Memory tip: think of thermal paste as the “handshake” between the CPU and heatsink—if the handshake is weak, the heat can’t pass through, no matter how fast the fan spins.
220-1201 Mobile Device Hardware Servicing Practice Question
This 220-1201 practice question tests your understanding of mobile device hardware servicing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is troubleshooting a laptop that shuts down randomly after a few minutes of use. The fan is spinning, and the vents are clear. The CPU temperature reaches 95°C quickly. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The thermal paste between the CPU and heatsink has dried out.
High CPU temperature despite a spinning fan indicates poor thermal transfer, often due to dried-out thermal paste or a heatsink that is not making proper contact. Reapplying thermal paste and reseating the heatsink is the solution. The fan working rules out a fan failure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
The fan is spinning, so the controller is likely fine; the issue is thermal transfer, not fan speed.
✓
The thermal paste between the CPU and heatsink has dried out.
Why this is correct
Dried thermal paste reduces heat transfer, causing rapid overheating even with a working fan.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CPU is faulty and needs replacement.
Why it's wrong here
A faulty CPU is possible but less likely than a thermal paste issue; overheating is a common symptom of poor thermal contact.
✗
The BIOS is set to an aggressive power-saving mode.
Why it's wrong here
Power-saving modes reduce performance, not cause overheating; they would lower temperatures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Mobile Device Hardware Servicing — This question tests Mobile Device Hardware Servicing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The thermal paste between the CPU and heatsink has dried out. — High CPU temperature despite a spinning fan indicates poor thermal transfer, often due to dried-out thermal paste or a heatsink that is not making proper contact. Reapplying thermal paste and reseating the heatsink is the solution. The fan working rules out a fan failure.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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