easyMultiple Choice
220-1201 Practice Question: During a desktop build, you install a new M.2…
During a desktop build, you install a new M.2 NVMe SSD into the M.2 slot. When you power on the system, the BIOS does not detect the drive. The SSD is known to be working. What is the most likely motherboard-related cause?
⚠ Common exam trap
220-1201 often tests the confusion between M.2 form factor and NVMe protocol, so candidates assume any M.2 drive works in any M.2 slot, missing the SATA-vs-NVMe slot wiring distinction.
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 M.2 slot is SATA-only and the drive is NVMe
The most likely motherboard-related cause is that the M.2 slot is SATA-only while the installed drive is NVMe, because SATA M.2 slots use the SATA controller and cannot communicate with NVMe drives that use PCIe lanes. The drive is known-good, so the incompatibility is between the slot's supported protocol and the drive's interface. This is a common desktop build mistake.
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 M.2 slot is SATA-only and the drive is NVMe
Why this is correct
M.2 slots are versatile but can be protocol-specific, supporting either SATA or NVMe (PCIe-based) communication. If a motherboard's M.2 slot is wired only for SATA, it lacks the necessary PCIe lanes and controller logic to interface with an NVMe drive. Consequently, an NVMe M.2 drive installed in a SATA-only M.2 slot will not be detected by the system BIOS or operating system, as the electrical and logical communication protocols are incompatible despite a potential physical fit.
- ✗
The CMOS battery needs replacement
Why it's wrong here
A failing or dead CMOS battery primarily affects the retention of BIOS/UEFI settings, such as system time, date, and boot order, when the system loses power. While it might cause the system to revert to default settings upon reboot, it does not directly interfere with the physical detection or initialization of newly installed hardware components like an M.2 drive. The motherboard's power delivery and data bus for the M.2 slot would remain operational regardless of the CMOS battery's charge.
- ✗
The motherboard BIOS is corrupted
Why it's wrong here
A corrupted motherboard BIOS (Basic Input/Output System) would typically manifest as severe system instability, boot failures, or a complete inability to POST (Power-On Self-Test). Such a critical issue would affect the entire system's initialization process, preventing it from even reaching a stage where it could attempt to detect specific storage devices like an M.2 drive. It is highly unlikely to cause only the isolated symptom of a single M.2 drive not being detected while the rest of the system functions normally.
- ✗
The CPU is not seated properly
Why it's wrong here
An improperly seated CPU would prevent the system from completing the Power-On Self-Test (POST) and typically result in a "no-post" condition, meaning no display output, no beeps, or a complete system shutdown shortly after power-on. Since the CPU is crucial for initializing memory, controlling PCIe lanes (which M.2 NVMe drives utilize), and orchestrating the entire boot process, an issue with its seating would halt the system before it could even attempt to detect or interact with an M.2 drive.
Go deeper
Related to this question
Learn chapter
Troubleshoot: Power and POST Failures
Key term
Peripheral Component Interconnect Express
PCI Express (PCIe) is a high-speed expansion bus standard that connects internal hardware components like graphics cards, SSDs, and network adapters to a computer's motherboard.
Key term
BIOS
BIOS (Basic Input/Output System) is the low-level firmware stored on a motherboard chip that initializes and tests hardware components before loading the operating system.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.