While performing routine maintenance you notice a faint but distinct burning odor coming from a user's tower PC. The system is still powered on and the user has not complained of performance issues yet. To protect the equipment and yourself, what is the FIRST action you should take?
Launch the operating system's built-in memory diagnostic tool to rule out RAM errors.
Shut the PC down immediately and unplug it from the wall outlet before inspecting the hardware.
Download and apply the latest BIOS/UEFI update from the manufacturer's website.
Remove the heat sink, clean off the thermal compound, and apply new thermal paste to the CPU.
A burning smell indicates that an electrical component-most often the power supply, voltage-regulator circuitry on the motherboard, or a shorted cable-is overheating. Continuing to operate the system risks fire and further damage. The correct first response is to power the computer down and disconnect it from the AC outlet so current can no longer flow. Only after the unit is safely de-energized should you open the case or run diagnostics. Running memory tests, updating firmware, or re-applying thermal paste leave the hazard energized and could worsen damage or cause personal injury.
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