220-1101 Hardware Practice Question
A technician is building a custom workstation for 3D rendering. The components include an AMD Ryzen 7 5800X CPU, a B550 motherboard (box states 'AMD Ryzen 3000 desktop ready'), two 16GB DDR4-3600 modules (on the QVL), and a dedicated GPU. The system powers on, case fans spin, and the CPU fan spins, but the motherboard’s CPU debug LED remains lit and there is no display. The technician has reseated the CPU and found no bent pins. The RAM and GPU have been verified working in another system. The PSU is a known-good 750W unit. Which of the following should the technician do NEXT?
⚠ Common exam trap
The trap here is that candidates see the system powers on and assume a hardware failure (like a bad PSU or motherboard), rather than recognizing the BIOS version incompatibility between the 'Ryzen 3000 ready' label and the Ryzen 5000 CPU.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade the motherboard BIOS using the BIOS flashback feature
The B550 motherboard is labeled 'AMD Ryzen 3000 desktop ready,' meaning its factory BIOS supports Ryzen 3000 CPUs but not Ryzen 5000 (Vermeer) CPUs like the Ryzen 7 5800X. The CPU debug LED staying lit indicates the motherboard cannot initialize the CPU, which is a classic symptom of an incompatible BIOS version. Using the BIOS flashback feature allows the technician to update the BIOS without a compatible CPU installed, enabling support for the Ryzen 5000 series.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace the power supply with a higher-wattage unit
Why it's wrong here
The CPU debug LED indicates the motherboard cannot initialize the CPU, which is a compatibility or BIOS issue, not a power delivery issue. The fact that fans spin and the board receives power shows the PSU is functioning. Even if wattage were marginal, a CPU debug LED is not the symptom of insufficient power; instead, you'd see random shutdowns or failure to spin up under load. Replacing the PSU addresses a nonexistent power problem and delays the correct fix.
- ✓
Upgrade the motherboard BIOS using the BIOS flashback feature
Why this is correct
The motherboard likely has an older BIOS that does not support the Ryzen 5000 series CPU. Updating the BIOS to the latest version may enable compatibility and allow the system to POST. Many B550 boards can be updated without a CPU using a USB flash drive and a dedicated button.
- ✗
Test the system with a known-working Ryzen 3000 CPU
Why it's wrong here
Testing with a Ryzen 3000 CPU would not resolve the specific issue of the Ryzen 7 5800X (Zen 3) failing to boot. The B550 motherboard, while compatible with Zen 3, typically requires a BIOS update to support these newer CPUs, especially if its box states 'Ryzen 3000 desktop ready' (Zen 2). This option is tempting as it tests the motherboard with a CPU generation it explicitly supports out-of-the-box. It would be a valid troubleshooting step if the technician was trying to verify the motherboard's basic functionality with a known-good, natively supported CPU, or if the primary suspect was a faulty Ryzen 3000 CPU.
- ✗
Replace the motherboard with a newer model that officially supports Ryzen 5000
Why it's wrong here
While a newer motherboard would have out-of-the-box support for Ryzen 5000, it is a costly and disruptive solution when the existing B550 board can be updated via BIOS flashback without even needing a compatible CPU installed. The issue is specifically an outdated firmware, not a hardware defect. Motherboard replacement is a last resort after BIOS update and CPU testing fail. Also, swapping boards may invalidate other component compatibility and void the builder's budget.
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Key term
Advanced Micro Devices
Advanced Micro Devices (AMD) is a company that designs and manufactures central processing units (CPUs), graphics processing units (GPUs), and other computer hardware components used in personal computers, servers, and embedded systems.
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A light-emitting diode (LED) is a semiconductor device that emits light when an electric current passes through it, commonly used as an indicator or illumination source in electronic devices.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.