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Question

Difficulty: EasyMotherboard, RAM, CPU, and Power Issues

A desktop computer shuts down unexpectedly after running heavy processor workload applications for several minutes. A technician suspects the CPU is overheating due to degraded thermal compound. In what order should the technician perform the following steps to properly service the CPU thermal interface and verify the resolution?

  1. 1Disconnect power to the workstation and unfasten the CPU heatsink assembly from the motherboard.
  2. 2Clean old, dried thermal compound off both the CPU heat spreader and the heatsink surface using isopropyl alcohol.
  3. 3Apply a small, pea-sized dot of new thermal paste onto the center of the CPU heat spreader.
  4. 4Secure the heatsink assembly evenly, reconnect the CPU fan power header, and monitor thermal readings in the BIOS/UEFI.

Answer

Disconnect power and remove heatsink -> Clean off old thermal compound -> Apply small dot of new thermal paste -> Reinstall heatsink, connect fan, and verify temperatures in BIOS/UEFI.
The correct diagnostic and repair sequence begins with safely isolating power and removing the heatsink. Next, old compound is cleaned off with isopropyl alcohol so fresh thermal paste can be applied to a clean metal surface. Finally, the heatsink is remounted securely, the fan power cable is reconnected, and temperature levels are monitored in the BIOS/UEFI setup utility.

Step-by-Step Solution

1
Disconnect workstation power and remove the CPU cooling heatsink assembly.
The CPU heat spreader surface and heatsink contact plate are exposed.
Ensures physical safety and permits direct access to the thermal interface.
2
Clean dried thermal compound using high-percentage isopropyl alcohol and a lint-free cloth.
Both contact surfaces are clean and free of old debris.
Old, dried thermal paste acts as an insulator rather than a conductor, preventing effective heat dissipation.
3
Dispense a small, pea-sized dot of fresh thermal paste onto the center of the CPU heat spreader.
Thermal paste is positioned to spread evenly under pressure.
Provides optimal thermal conductivity without overflowing onto motherboard components.
4
Reattach the heatsink evenly, plug in the CPU_FAN header, power on the system, and check CPU temperature hardware monitors in BIOS/UEFI.
The cooling fan receives power and processor operating temperatures are confirmed within normal ranges.
Validates that the cooling system is fully functional and thermal throttling/overheating is resolved.

Key Concept

CPU Cooling Maintenance and Thermal Interface Servicing
Estimated Time:1m 0s
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Topics

Motherboard, RAM, CPU, and Power Issues

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