- A
The CPU is not seated properly
Why wrong: An improperly seated CPU would typically cause the system to not power on or to immediately shut down to prevent damage, not just display a blank screen.
- B
The motherboard BIOS needs an update
A BIOS update is often required to support newer CPU models, even if the socket is physically compatible; without it, the system may power on but not post.
- C
The RAM is incompatible with the new CPU
Why wrong: While RAM compatibility can cause boot issues, it is less likely than a BIOS mismatch when the CPU is newly installed and the system powers on but shows no display.
- D
The power supply is insufficient
Why wrong: An insufficient power supply usually causes random shutdowns or failure to power on, not a blank screen with fans running.
Quick Answer
The answer is that the motherboard BIOS needs an update. Even when a new CPU physically fits the socket, the system’s firmware must contain the microcode required to recognize and initialize the processor; without that update, the motherboard cannot complete the Power-On Self-Test (POST), resulting in a blank screen despite fans spinning and lights turning on. This scenario directly tests your understanding of firmware compatibility versus physical compatibility, a common trap on the CompTIA A+ Core 1 220-1201 exam where many students assume socket fit guarantees functionality. The exam often presents this as a troubleshooting step: if you see a “CPU upgrade blank screen,” always verify the BIOS version against the CPU support list before swapping hardware. A useful memory tip is “Socket fits, but BIOS quits”—meaning physical match doesn’t guarantee boot, so check the firmware first.
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 client wants to upgrade their desktop PC with a new, faster processor. They have purchased a CPU that is listed as compatible with the motherboard's socket type. After installation, the system powers on but displays a blank screen. What is the most likely issue?
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 choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The motherboard BIOS needs an update
Even if the CPU fits the socket, the motherboard's BIOS/UEFI may require an update to support a newer CPU model. This is a common scenario where the hardware is physically compatible but the firmware is outdated. The system powers on but fails to post because the BIOS does not recognize the CPU.
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.
- ✗
The CPU is not seated properly
Why it's wrong here
An improperly seated CPU would typically cause the system to not power on or to immediately shut down to prevent damage, not just display a blank screen.
- ✓
The motherboard BIOS needs an update
Why this is correct
A BIOS update is often required to support newer CPU models, even if the socket is physically compatible; without it, the system may power on but not post.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The RAM is incompatible with the new CPU
Why it's wrong here
While RAM compatibility can cause boot issues, it is less likely than a BIOS mismatch when the CPU is newly installed and the system powers on but shows no display.
- ✗
The power supply is insufficient
Why it's wrong here
An insufficient power supply usually causes random shutdowns or failure to power on, not a blank screen with fans running.
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.
Trap categories for this question
Command / output trap
While RAM compatibility can cause boot issues, it is less likely than a BIOS mismatch when the CPU is newly installed and the system powers on but shows no display.
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.
What to study next
Got this wrong? Here's your next step.
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.
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Motherboard — study guide chapter
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Motherboard practice questions
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Motherboard — This question tests Motherboard — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The motherboard BIOS needs an update — Even if the CPU fits the socket, the motherboard's BIOS/UEFI may require an update to support a newer CPU model. This is a common scenario where the hardware is physically compatible but the firmware is outdated. The system powers on but fails to post because the BIOS does not recognize the CPU.
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: "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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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