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Difficulty: Very hardMotherboard, RAM, CPU, and Power Issues

A field technician is troubleshooting a mobile workstation that fails to complete POST following a hardware memory upgrade. Upon powering on the system, the display remains blank, and the power LED flashes a repeating pattern of three short blinks followed by one long blink. Believing the system board firmware is corrupted, the technician unsuccessfully attempts a USB BIOS recovery procedure. Which of the following is the most appropriate NEXT step for the technician to resolve the issue?

  1. Remove the newly installed RAM module and verify that its specific SO-DIMM form factor, voltage, and density match the motherboard's slot requirements.Answer
  2. B
    Replace the installed memory with a standard full-sized unbuffered DDR4 DIMM module to test channel stability.
  3. C
    Replace the motherboard assembly under the assumption that the integrated graphics controller or internal display cable has suffered a hardware failure.
  4. D
    Boot the system using an external USB flash drive to perform a clean operating system reinstallation.

Answer

Remove the newly installed RAM module and verify that its specific SO-DIMM form factor, voltage, and density match the motherboard's slot requirements.
The diagnostic LED blink sequence indicates a POST memory detection error caused by the recent RAM upgrade. The technician must inspect the installed SO-DIMM module to ensure its form factor, speed, and density meet motherboard specifications and that it is fully seated in the slot.

Step-by-Step Solution

1
Analyze the diagnostic indicator code emitted by the system during startup.
The 3-short, 1-long LED blink code indicates a pre-boot memory detection or memory training error during POST.
System diagnostic LED patterns provide hardware status alerts prior to display initialization or operating system handoff.
2
Evaluate recent system modifications.
The failure occurred immediately after a memory upgrade, pointing directly to an incompatible, defective, or improperly seated memory module.
Established troubleshooting methodology requires isolating recent hardware changes as the primary suspect.
3
Inspect and verify memory compatibility and installation.
Removing the module and confirming it meets SO-DIMM form factor and motherboard density specifications resolves memory training failures.
Physical inspection of SO-DIMM modules verifies correct slot keying, pin alignment, and density compatibility without unnecessary component replacement.

Key Concept

Identifying diagnostic POST light codes and resolving mobile workstation SO-DIMM initialization and compatibility failures.
Estimated Time:2m 0s
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Topics

Motherboard, RAM, CPU, and Power Issues

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