220-1101 Hardware Practice Question
A user’s desktop computer has 16 GB of physical RAM installed (2 x 8 GB modules), but the operating system and BIOS both report only 8 GB as available. The computer powers on normally and displays video. What is the most likely cause of this issue?
⚠ Common exam trap
CompTIA often tests the misconception that a reduction in reported RAM is always a software or OS issue, when in fact the BIOS memory count is a hardware-level detection that points to a physical connection problem like an unseated module.
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
✓
One RAM module is not seated properly
The most likely cause is that one of the two 8 GB RAM modules is not seated properly in its slot. When a RAM module is not fully inserted, the system may fail to detect it during POST, resulting in the BIOS and OS reporting only half the installed memory (8 GB instead of 16 GB). The computer still powers on and displays video because the remaining module provides sufficient memory for basic operation.
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 CPU is failing
Why it's wrong here
A failing CPU typically causes system crashes, boot failures, random instability, or a failure to POST. It does not selectively disable one RAM module while leaving the rest of the system functional. On modern CPUs, the integrated memory controller might cause memory issues if damaged, but that would manifest as errors, not a clean halving of reported capacity. Since the machine otherwise operates normally, CPU failure is an unlikely explanation.
- ✓
One RAM module is not seated properly
Why this is correct
If one of the two RAM modules is not fully inserted into its DIMM slot, the BIOS cannot detect it during the POST memory initialization. The module's gold contacts may not align with the slot pins, or the retaining clips may not be locked, preventing the SPD and data lines from connecting. As a result, only the other 8 GB module is recognized, yielding a total of 8 GB. This is the most probable cause given that the system boots and otherwise runs.
- ✗
The GPU is overheating
Why it's wrong here
The GPU handles graphics rendering; overheating typically produces screen artifacts, driver timeouts, visual glitches, or thermal shutdowns under heavy load. It does not affect the system's reported physical RAM capacity because the memory controller and BIOS determine that during POST. A GPU fault cannot electrically disable or hide a RAM module. Therefore, GPU overheating is unrelated to the symptom of halved RAM.
When this WOULD be correct
A user reports that their computer shuts down randomly during gaming, and the GPU fan is not spinning. In that scenario, GPU overheating is the most likely cause of the shutdowns.
- ✗
The operating system is corrupted
Why it's wrong here
A corrupted operating system could potentially show incorrect memory numbers in the OS interface, but the BIOS/UEFI also reports 8 GB, which proves the issue is at the hardware detection level. The OS obtains its RAM size from the firmware memory map, so if the firmware sees only one module, the OS will report 8 GB. Corruption does not alter firmware-level hardware enumeration. Hence, the OS is not the cause.
When this WOULD be correct
This option would be correct in a scenario where a computer fails to boot, displays error messages like 'Bootmgr is missing', or experiences frequent blue screens after a recent update or malware infection, with hardware diagnostics passing.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓One RAM module is not seated properlyCorrect answer▾
Why this is correct
If one of the two RAM modules is not fully inserted into its DIMM slot, the BIOS cannot detect it during the POST memory initialization. The module's gold contacts may not align with the slot pins, or the retaining clips may not be locked, preventing the SPD and data lines from connecting. As a result, only the other 8 GB module is recognized, yielding a total of 8 GB. This is the most probable cause given that the system boots and otherwise runs.
✗The GPU is overheatingWrong answer — click to see why▾
Why this is wrong here
GPU overheating would cause graphical artifacts, crashes, or shutdowns, not a reduction in reported RAM capacity. The system boots and displays video normally, ruling out GPU issues.
★ When this WOULD be the correct answer
A user reports that their computer shuts down randomly during gaming, and the GPU fan is not spinning. In that scenario, GPU overheating is the most likely cause of the shutdowns.
Why candidates choose this
Candidates may confuse symptoms of hardware failure, assuming any hardware issue could cause memory misreporting, or they may overthink the problem and suspect the GPU due to its complexity.
✗The operating system is corruptedWrong answer — click to see why▾
Why this is wrong here
A corrupted operating system would typically cause boot failures, crashes, or errors, not a reduction in reported RAM from 16 GB to 8 GB. The OS and BIOS both reporting 8 GB indicates a hardware-level issue, not software corruption.
★ When this WOULD be the correct answer
This option would be correct in a scenario where a computer fails to boot, displays error messages like 'Bootmgr is missing', or experiences frequent blue screens after a recent update or malware infection, with hardware diagnostics passing.
Why candidates choose this
Candidates may assume that OS corruption can cause memory misreporting, confusing symptoms like system instability or incorrect resource reporting with actual corruption, especially when other hardware seems functional.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Learn chapter
RAM Types and Memory Slots
Key term
RAM
RAM (Random-Access Memory) is volatile computer memory that temporarily stores data for quick access by the CPU.
Key term
Dual In-line Memory Module
A Dual In-line Memory Module (DIMM) is a small circuit board that holds memory chips and plugs into a computer's motherboard to provide Random Access Memory (RAM).
About these practice questions
Courseiva writes every 220-1101 question from scratch — 896 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.