The answer is to update the BIOS to a version that supports the new CPU. This is the correct first step because the motherboard’s Basic Input/Output System contains microcode that tells the hardware how to initialize the processor; without a firmware update that includes the new CPU’s microcode, the system will power on but fail to complete the Power-On Self-Test, resulting in a black screen with no POST. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of CPU compatibility and the critical role of firmware updates in hardware support—a common trap is to assume the CPU is defective or the power supply is failing, when the real issue is an outdated BIOS. A helpful memory tip is “New CPU, new BIOS first”—always check the motherboard manufacturer’s support page for the required BIOS version before assuming hardware failure.
220-1201 BIOS / UEFI Practice Question
This 220-1201 practice question tests your understanding of bios / uefi. 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.
After replacing a CPU in a desktop, the system powers on but shows a black screen with no POST. The old CPU worked fine. Which BIOS-related step should be taken first?
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
✓
Update the BIOS to a version that supports the new CPU
Many motherboards require a BIOS update to support newer CPU microcode. Without it, the system cannot initialize the CPU. This question tests knowledge of CPU compatibility and the role of firmware updates in hardware support.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Reset the CMOS by removing the battery
Why it's wrong here
Resetting CMOS clears settings but does not add CPU microcode support.
✓
Update the BIOS to a version that supports the new CPU
Why this is correct
A BIOS update provides the necessary microcode for the new CPU to function.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Check the CPU power cable connection
Why it's wrong here
While power connections are important, the symptom of no POST with a new CPU often points to firmware compatibility.
✗
Enable legacy boot mode
Why it's wrong here
Boot mode does not affect CPU initialization; the issue is microcode support.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
BIOS / UEFI — This question tests BIOS / UEFI — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Update the BIOS to a version that supports the new CPU — Many motherboards require a BIOS update to support newer CPU microcode. Without it, the system cannot initialize the CPU. This question tests knowledge of CPU compatibility and the role of firmware updates in hardware support.
What should I do if I get this 220-1201 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Question Discussion
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