220-1201 Practice Question: A user complains that their PC sometimes fails to…

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 CPU socket pins

  Why it's wrong here

  Bent CPU socket pins prevent proper electrical contact between the CPU and the motherboard, which can lead to a complete failure to boot, system instability, or incorrect recognition of installed hardware components. While this is a severe hardware fault that can halt system operation, it does not directly corrupt the non-volatile CMOS memory or trigger a specific CMOS checksum error, which is a diagnostic message related to the integrity of stored BIOS settings.

• ✓

  The BIOS/UEFI chip

  Why this is correct

  The BIOS/UEFI chip stores the system's firmware and the critical CMOS settings, along with a checksum used to verify their integrity. A failing BIOS/UEFI chip, or corruption within its firmware, can prevent the reliable storage or retrieval of these settings, causing the system to consistently report a CMOS checksum error. This occurs even when the CMOS battery is functional, as the underlying storage mechanism or the firmware itself is compromised.

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  The RAM modules

  Why it's wrong here

  Faulty RAM modules typically cause system instability, random crashes, blue screens of death (BSODs), or prevent the system from booting entirely, often indicated by specific POST beep codes. While essential for system operation, issues with RAM do not directly affect the integrity of the non-volatile CMOS settings stored on the motherboard. Therefore, faulty RAM would not be the direct cause of a CMOS checksum error, which specifically relates to the corruption of stored BIOS configuration data.

• ✗

  The power supply unit

  Why it's wrong here

  A failing power supply unit (PSU) delivers insufficient or unstable power to the system's components, leading to symptoms such as random shutdowns, intermittent reboots, or a complete failure to power on. While an unstable power environment can indirectly cause various issues, a failing PSU does not directly corrupt the CMOS settings or the BIOS firmware itself. Consequently, it would not typically manifest as a specific CMOS checksum error, which points to data integrity issues within the BIOS configuration.

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