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Difficulty: HardMotherboard, RAM, CPU, and Power Issues

An IT technician is performing a memory upgrade on a workstation PC. The technician installs two new identical 16 GB DDR4-3200 memory modules into the primary dual-channel slots specified by the motherboard manual. When attempting to boot the computer, the power LED flashes a repeating code indicating a memory initialization failure, and no display appears on the monitor. When testing each 16 GB module individually in the primary slot, the computer boots into the operating system without errors. However, whenever both modules are installed simultaneously in the dual-channel configuration, the system fails to pass the Power-On Self-Test (POST). Which of the following is the MOST likely cause of this issue?

  1. The motherboard BIOS/UEFI firmware requires an update to improve memory compatibility and address dual-channel stability issues.Answer
  2. B
    The technician installed standard desktop DIMM modules into laptop SO-DIMM slots, resulting in physical contact failure.
  3. C
    The memory initialization POST failure indicates operating system bootloader corruption on the primary storage drive.
  4. D
    Installing memory sticks in dual-channel configuration prevents the motherboard VRM from delivering power to the CPU.

Answer

Updating the motherboard BIOS/UEFI firmware is the most likely resolution, as firmware updates frequently add updated memory AGESA/code profiles and microcode adjustments required to successfully initialize matching high-speed RAM modules operating in multi-channel configurations.
The correct option highlights updating the motherboard BIOS/UEFI firmware. When individual memory sticks function in single-channel mode but fail to pass POST when populated together in dual-channel slots, the motherboard memory controller often requires updated firmware containing enhanced memory compatibility tables and voltage/timing training profiles.

Step-by-Step Solution

1
Analyze diagnostic symptoms provided in the scenario.
Identified that each RAM module operates cleanly when populated individually, ruling out defective memory hardware or a dead memory slot.
Since both RAM modules function individually in single-channel mode, the physical memory chips and slot 1 hardware are verified working.
2
Evaluate the failure domain during multi-module initialization.
System POST fails specifically during dual-channel initialization and memory training at high frequency.
Running dual channels increases stress on the CPU memory controller and motherboard bus lines, requiring precise timing and voltage control.
3
Select the appropriate CompTIA troubleshooting step for motherboard memory compatibility.
Updating the BIOS/UEFI provides the necessary system microcode and memory training tables required for stable dual-channel operation.
Outdated BIOS/UEFI versions often lack optimized memory training code (SPD timing management) for newer or higher-density dual-channel module combinations.

Key Concept

Motherboard BIOS/UEFI Memory Compatibility & Dual-Channel Troubleshooting
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Topics

Motherboard, RAM, CPU, and Power Issues

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