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Difficulty: HardMotherboard, RAM, CPU, and Power Issues

A technician is troubleshooting a high-performance workstation PC that fails to complete the Power-On Self-Test (POST). When pressing the power button, the system chassis fans turn on at maximum speed, but no video display signal is output, no POST diagnostic beep codes are produced by the motherboard speaker, and the onboard debug LED stays permanently frozen on the CPU initialization state code (00). Which of the following initial diagnostic procedures should the technician perform to isolate the underlying hardware failure? (Select TWO.)

  1. Reseat the central processing unit (CPU) and inspect the motherboard socket pins for bends or thermal paste contamination.Answer
  2. Perform a bare-bones bench test outside the chassis using only the motherboard, CPU, power supply, and a single memory module.Answer
  3. C
    Reinstall the system host operating system using external installation media to restore corrupted system boot files.
  4. D
    Swap the desktop memory modules with laptop SO-DIMM RAM modules to verify physical pin compatibility.

Answer

The technician should reseat the CPU while inspecting the socket pins and execute a minimal bare-bones bench test outside the chassis.
The correct troubleshooting steps focus on early pre-POST failure resolution: checking physical CPU seating and socket pin integrity, and removing the motherboard from the metal chassis to eliminate ground shorts while testing only fundamental core hardware.

Step-by-Step Solution

1
Analyze the observed system failure indicators
System experiences a hardware pre-POST halt; fans spin at full speed, debug LED freezes on CPU state (00), and no POST beep codes are produced.
Indicates the failure occurs before firmware handoff to RAM or video initialization, placing the primary fault on CPU seating/socket, power delivery, or motherboard grounding.
2
Isolate CPU hardware interface issues
Reseating the CPU ensures even mounting pressure, correct socket pin contact, and lack of socket damage.
Damaged pins or misaligned CPU contact pads prevent basic microcode execution required to progress past debug code 00.
3
Eliminate chassis shorts and peripheral interference
Disconnect all unnecessary peripherals and remove the motherboard from the chassis for bench testing.
A metallic standoff shorting the motherboard or a shorted expansion card can cause the power supply or motherboard logic to latch into a pre-POST CPU lock state.

Key Concept

Pre-POST Hardware Fault Isolation and CPU Diagnostic Troubleshooting
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Topics

Motherboard, RAM, CPU, and Power Issues

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