Troubleshooting PC Shutdown After 30 Minutes: Thermal Paste and CPU Cooler Check

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Replace the motherboard

  Why it's wrong here

  Replacing the motherboard is an irreversible and expensive repair that should only be considered after exhaustive testing of thermal and power subsystems; doing it prematurely can ignore a simple fix. Motherboard failures usually manifest as inconsistent boot issues, memory errors, or visible physical damage like bulging capacitors, not as a repeatable shutdown after a predictable runtime. The routine nature of the shutdown points to a heat-related mechanism, specifically the CPU's thermal-overload protection, which a motherboard swap would not address unless the board's voltage regulation or thermal sensing circuitry is also defective. Starting by checking the CPU cooler and thermal paste is a logical, low-cost diagnostic that must be performed first.

  When this WOULD be correct

  A technician has already ruled out overheating (CPU cooler seated, thermal paste applied, fans working) and power supply issues, but the system still fails to POST or has intermittent crashes. In that scenario, a faulty motherboard could be the root cause.

• ✗

  Update the GPU driver

  Why it's wrong here

  Updating the GPU driver is typically aimed at resolving rendering faults, display freezes, or TDR (timeout detection and recovery) events, not an instant cut of system power. Driver-level crashes usually produce a blue screen or an application error, but a hard shutdown with no logging is characteristic of a hardware-level thermal trip. The note mentions that case fans are spinning, which implies the cooling system is receiving power, but the GPU driver cannot influence the CPU temperature or the thermal-trip circuit that directly cuts power. Therefore, while a GPU driver update may be a preventative maintenance step, it does not target the observed failure mode.

  When this WOULD be correct

  A technician is troubleshooting a workstation that experiences graphical artifacts or crashes only during gaming or GPU-intensive tasks. In that scenario, updating the GPU driver could fix software-related instability.

• ✓

  Check the CPU cooler for proper contact and reapply thermal paste

  Why this is correct

  Random shutdowns that occur after consistent runtime point to thermal protection triggering rather than a driver or hardware fault. A CPU cooler that is not firmly seated or has dried-out thermal paste leaves air gaps that impede conductive heat transfer, causing the processor to quickly reach its TjMax threshold. When the CPU's thermal sensor exceeds that limit, the voltage regulator or PMC initiates an immediate power-off to prevent silicon damage, which appears as a random shutdown. Reseating the cooler and applying fresh, high-quality thermal paste with correct mounting pressure directly addresses the most likely root cause.

• ✗

  Disable the onboard network interface card (NIC)

  Why it's wrong here

  Disabling the onboard NIC is completely orthogonal to the CPU heat-generation path because the NIC has its own power domain and does not contribute measurable heat to the CPU package. The NIC is a low-power device that, when faulty, might cause resource conflicts or network dropouts, but it cannot trigger the system's thermal-shutdown circuit that forces a power-off. Even if the NIC were resetting internally, it would not cause the entire system to lose power instantly, making this step a red herring in the troubleshooting flow. Therefore, this action is not only irrelevant to the symptom but also wastes valuable problem-solving time.

  When this WOULD be correct

  A technician is troubleshooting intermittent network connectivity on a workstation. After updating drivers and checking cables, the issue persists. Disabling the onboard NIC in BIOS to force use of a dedicated NIC would be the next step to isolate the problem.

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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