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220-1201 Practice Question: A customer complains that their computer takes a…
A customer complains that their computer takes a very long time to boot and sometimes shows a 'CMOS Checksum Error' before starting. What is the most likely hardware issue?
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 CMOS battery is depleted
A CMOS checksum error indicates that the BIOS/UEFI settings are not being retained, often due to a failing or dead CMOS battery. This causes time/date resets and boot delays as the firmware re-detects hardware. This tests knowledge of common CMOS-related symptoms.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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The hard drive is failing
Why it's wrong here
Hard drive issues primarily relate to the storage and retrieval of data, not the system's fundamental configuration settings stored in CMOS. A failing hard drive typically manifests as slow performance, read/write errors, corrupted files, or a complete inability to boot into the operating system due to inaccessible boot sectors or OS files. It does not directly affect the integrity of the BIOS/UEFI settings or trigger a CMOS checksum error.
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The RAM module is faulty
Why it's wrong here
RAM (Random Access Memory) is volatile memory used for active data processing and temporary storage during system operation. Faulty RAM modules commonly lead to system instability, blue screens of death (BSODs), random reboots, application crashes, or specific POST (Power-On Self-Test) beep codes indicating memory issues. While critical for system operation, RAM problems do not directly corrupt the non-volatile CMOS settings or cause a checksum error related to the BIOS configuration.
- ✓
The CMOS battery is depleted
Why this is correct
The CMOS battery (often a CR2032 coin cell) provides continuous power to the Complementary Metal-Oxide-Semiconductor (CMOS) memory chip, which stores critical system configuration settings like date, time, boot order, and hardware parameters. When this battery is depleted, the CMOS memory loses power, causing these settings to revert to default or become corrupted. This frequently results in a "CMOS checksum error" message during boot, as the system detects an inconsistency in its stored configuration.
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The UEFI firmware is corrupted
Why it's wrong here
UEFI (Unified Extensible Firmware Interface) firmware is the low-level software that initializes hardware components and manages the boot process. If the UEFI firmware itself is corrupted, the system would likely fail to POST, display specific error codes related to firmware integrity, or become completely unbootable, often referred to as a "bricked" state. While a CMOS checksum error indicates an issue with the *settings* stored by the firmware, it does not imply corruption of the firmware *code* itself.
Go deeper
Related to this question
Learn chapter
Laptop Hardware and Components
Key term
Firmware
Firmware is specialized software permanently stored in read-only memory on a hardware device that controls how that device operates at a basic level.
Key term
Complementary Metal-Oxide Semiconductor
A type of semiconductor technology used in microchips that combines two types of transistors to create circuits with very low power consumption.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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