The answer is the BIOS/UEFI chip. A CMOS checksum error after battery replacement means the system is still failing to verify the integrity of stored BIOS settings, which points to a problem with the firmware storage itself rather than the power source. The CMOS battery only maintains the settings while the system is off; if the BIOS/UEFI chip is corrupted or failing, it cannot properly save or retrieve the configuration data, causing the checksum mismatch on every boot. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your ability to differentiate between a battery issue and a deeper motherboard-level fault—a common trap is to replace the battery again or reseat RAM, when the real culprit is the chip holding the firmware. Remember the mnemonic: “Battery for power, BIOS for storage—if the error persists, the chip is the core.”
220-1201 Motherboard Practice Question
This 220-1201 practice question tests your understanding of motherboard. 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 user complains that their PC sometimes fails to boot and displays a 'CMOS Checksum Error' message. After replacing the CMOS battery, the error persists. What motherboard component should you inspect next?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The BIOS/UEFI chip
A CMOS checksum error indicates the BIOS settings are corrupted or not being saved. If a new battery doesn't fix it, the CMOS (RTC) chip itself may be failing, or the BIOS/UEFI firmware may need to be reset or updated. This points to a hardware issue on the motherboard beyond the battery.
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 CPU socket pins
Why it's wrong here
Bent CPU pins cause boot failures or instability, but not specifically CMOS checksum errors.
✓
The BIOS/UEFI chip
Why this is correct
A failing BIOS chip or corrupted firmware can cause persistent checksum errors even with a good battery.
Related concept
Read the scenario before looking for a memorised answer.
✗
The RAM modules
Why it's wrong here
Faulty RAM can cause boot issues but typically triggers beep codes or memory errors, not CMOS checksum errors.
✗
The power supply unit
Why it's wrong here
A failing PSU would cause random shutdowns or no power, not a specific BIOS checksum error.
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.
Motherboard — This question tests Motherboard — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The BIOS/UEFI chip — A CMOS checksum error indicates the BIOS settings are corrupted or not being saved. If a new battery doesn't fix it, the CMOS (RTC) chip itself may be failing, or the BIOS/UEFI firmware may need to be reset or updated. This points to a hardware issue on the motherboard beyond the battery.
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.
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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