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220-1201 Practice Question: A technician is troubleshooting a desktop that…
A technician is troubleshooting a desktop that beeps three times repeatedly and shows a blank screen upon power-on. The system has a discrete GPU installed and two sticks of RAM. What is the most likely cause indicated by the beep code?
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
✓
The RAM is faulty or not properly installed.
Beep codes are used by the BIOS/UEFI to indicate hardware errors during POST. Three beeps typically indicate a memory (RAM) error. The technician should reseat or test the RAM sticks individually to isolate the faulty module.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The discrete GPU is not seated properly.
Why it's wrong here
A discrete GPU not properly seated typically results in no video output or specific video-related beep codes, such as one long and two or three short beeps, depending on the BIOS manufacturer. Three repeated beeps are not a standard diagnostic pattern for a loose or faulty graphics card. While a completely failed GPU might prevent POST, a specific three-beep pattern usually points elsewhere in the system.
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The CPU has failed or is overheating.
Why it's wrong here
CPU failure or overheating often manifests as continuous short beeps, a complete lack of POST activity, or a system shutdown without any beep codes. While some BIOS versions might have specific patterns for CPU thermal events, three repeated beeps are not a common indicator for a failed or critically overheated CPU. A CPU that cannot initialize properly typically halts the boot process before specific diagnostic beeps are generated.
- ✓
The RAM is faulty or not properly installed.
Why this is correct
Three repeated beeps are a widely recognized Power-On Self-Test (POST) error code, particularly in AMI BIOS systems, indicating a memory issue. This pattern signifies that the system cannot properly detect, initialize, or access the installed Random Access Memory. A technician should first attempt to reseat the RAM modules, then test them individually, or replace them if the issue persists.
- ✗
The BIOS battery is dead.
Why it's wrong here
A dead CMOS battery primarily causes the system to lose its date, time, and custom BIOS settings, reverting to default configurations upon reboot. This often results in a 'CMOS Checksum Error' message during POST, but it does not typically generate a specific hardware failure beep code like three repeated beeps. While a completely dead battery can sometimes prevent booting, it's not the direct cause of this particular beep pattern.
Go deeper
Related to this question
Learn chapter
Laptop Hardware and Components
Key term
BIOS
BIOS (Basic Input/Output System) is the low-level firmware stored on a motherboard chip that initializes and tests hardware components before loading the operating system.
Key term
RAM
RAM (Random Access Memory) is your computer's short-term memory, temporarily holding data the CPU needs right now or very soon.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 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 220-1201 exam.