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220-1201 Practice Question: A customer says their PC randomly freezes and…
A customer says their PC randomly freezes and sometimes displays a blue screen error. You run diagnostics and find that the CPU passes all tests, but the system still crashes. Which component should you check next as a likely cause of CPU-related instability?
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 CPU fan
Even if the CPU itself is functional, instability can arise from other factors. Overheating due to a failing fan can cause intermittent crashes. The CPU fan is critical for maintaining safe temperatures under load.
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 hard drive
Why it's wrong here
A failing hard drive often manifests as data corruption, slow system performance, or blue screens of death (BSODs) during read/write operations, especially when accessing the page file or loading applications. While it can cause system freezes, these are typically tied to disk I/O operations rather than general, random instability that points more directly to thermal issues. The description of "randomly freezes" without specific mention of disk activity makes a failing hard drive a less probable primary cause compared to thermal issues.
- ✗
The power supply unit
Why it's wrong here
A failing power supply unit (PSU) can indeed cause random system shutdowns, reboots, or freezes due to insufficient or unstable power delivery to components. However, these issues often manifest as complete system power loss or intermittent failures across various components, not specifically as freezes that imply a component is overheating and throttling. While a PSU issue is serious, the symptom of "randomly freezes" points more specifically to a thermal management problem affecting the CPU, which is directly addressed by the CPU fan.
- ✓
The CPU fan
Why this is correct
A failing CPU fan directly impairs the processor's ability to dissipate heat, leading to rapid temperature increases under load. When the CPU reaches critical thermal thresholds, it will either throttle its performance to reduce heat or, if temperatures continue to rise, trigger a system shutdown or freeze to prevent permanent damage. This behavior perfectly aligns with "randomly freezes and sometimes" as the system struggles to maintain stable operation due to inadequate cooling, making the CPU fan the most direct and probable cause.
- ✗
The motherboard BIOS
Why it's wrong here
Corrupted or misconfigured motherboard BIOS (Basic Input/Output System) can certainly lead to system instability, boot failures, or unexpected behavior by incorrectly initializing hardware or managing power states. However, BIOS-related issues typically manifest as consistent boot problems, incorrect hardware detection, or specific error codes, rather than intermittent "random freezes" that strongly suggest a thermal problem. While a BIOS update might sometimes resolve stability issues, a physical component failure like a CPU fan is a more direct and common cause for overheating-induced freezes.
Go deeper
Related to this question
Learn chapter
Motherboard Components and Form Factors
Key term
CPU
The Central Processing Unit (CPU) is the main electronic brain of a computer that carries out instructions from software by performing basic arithmetic, logic, control, and input/output operations.
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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