The correct first step is to reseat the CPU. When a motherboard’s diagnostic LED shows a CPU error and the system fails to POST despite the fan spinning, it typically indicates a physical connection issue—such as bent pins on the socket or the processor not fully seated in its socket. Reseating the CPU re-establishes proper contact between the processor and the motherboard’s LGA or PGA pins, which is the most common cause of this specific error. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your ability to follow systematic troubleshooting methodology: always verify the simplest physical connections before replacing expensive components. A common trap is jumping straight to replacing the CPU or motherboard, but the exam emphasizes that reseating is the logical first step when a CPU error LED is present. Memory tip: “LED says CPU, reseat it first—don’t buy new.”
220-1101 CPU Practice Question
This 220-1201 practice question tests your understanding of cpu. 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 PC that fails to POST. The CPU fan spins, but there is no display output. The motherboard has a diagnostic LED that shows a CPU error. Which step should the technician take first to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reseat the CPU
A CPU error LED indicates a problem with the processor or its installation. The most common cause is improper seating or bent pins. Reseating the CPU is a logical first step before replacing components. This tests systematic troubleshooting methodology.
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.
✗
Replace the power supply
Why it's wrong here
The fan spinning suggests power is reaching the motherboard, so PSU replacement is premature.
✗
Update the BIOS using a USB flashback
Why it's wrong here
BIOS update might help if the CPU is unsupported, but the LED indicates a hardware error, not a compatibility issue.
✓
Reseat the CPU
Why this is correct
Reseating the CPU can correct misalignment or poor contact, which is a common cause of CPU error LEDs.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Replace the CPU
Why it's wrong here
Replacing the CPU should be done only after verifying that reseating and other checks fail.
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.
CPU — This question tests CPU — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reseat the CPU — A CPU error LED indicates a problem with the processor or its installation. The most common cause is improper seating or bent pins. Reseating the CPU is a logical first step before replacing components. This tests systematic troubleshooting methodology.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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