220-1201 Practice Question: A customer reports that their desktop computer…

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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  CPU throttling due to overheating

  Why it's wrong here

  CPU throttling is a protective mechanism where the processor dynamically reduces its clock speed and voltage to lower heat and prevent thermal damage when temperatures become too high. While overheating can lead to system instability and intermittent freezes, the act of throttling itself does not produce an audible high-pitched whine. Instead, it typically manifests as a noticeable slowdown in system performance or, in severe cases, an automatic shutdown, rather than an electrical sound.

• ✓

  Coil whine from the voltage regulator modules

  Why this is correct

  Coil whine is an audible electromagnetic noise produced by vibrating coils (inductors) within power delivery components, such as the Voltage Regulator Modules (VRMs) on a motherboard. This phenomenon occurs when the coils are subjected to rapidly changing electrical currents, causing them to vibrate at frequencies audible to humans. It is particularly common under fluctuating loads, such as during heavy CPU utilization or when transitioning between power states, and while primarily an auditory artifact, severe VRM instability or failure (which can manifest as whine) can indeed contribute to system instability and intermittent freezes.

• ✗

  A failing CPU fan bearing

  Why it's wrong here

  A failing CPU fan bearing typically produces mechanical noises such as grinding, rattling, or a persistent whirring sound, which are distinct from a high-pitched electrical whine. These sounds are caused by friction and wear within the bearing itself, indicating mechanical degradation. While a completely failed fan can lead to CPU overheating and subsequent throttling or system instability, the specific sound produced by a failing bearing is not a whine, and its operation is generally constant, not fluctuating with CPU load in a way that would cause intermittent freezing tied to a whine.

• ✗

  Incorrect CPU multiplier setting in BIOS

  Why it's wrong here

  An incorrect CPU multiplier setting in the BIOS directly affects the CPU's operating frequency (clock speed). Setting it too high can lead to immediate system instability, crashes, or a complete failure to boot, as the CPU attempts to operate beyond its stable limits without adequate voltage or cooling. Conversely, setting it too low would result in significantly reduced performance. This fundamental configuration issue would not generate an audible electrical whine; it causes computational errors or power delivery issues that manifest as system crashes or non-boot scenarios.

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