220-1101 Hardware Practice Question
A technician is assembling a new desktop computer. After installing the CPU, heat sink, RAM, and power supply, the system powers on for a few seconds and then shuts down. The CPU fan spins during that time. The technician has verified that the power supply connections are secure. Which of the following should the technician check FIRST?
⚠ Common exam trap
The trap here is that candidates often suspect a power supply or RAM issue first, overlooking that the CPU can run for a few seconds without adequate cooling before thermal protection kicks in.
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 thermal paste application between the CPU and heat sink
The system powers on for a few seconds and then shuts down, which is a classic symptom of thermal overload protection (Tjmax) being triggered. Since the CPU fan spins, power delivery is present, but without proper thermal paste, the CPU rapidly exceeds its critical temperature threshold, causing an immediate shutdown to prevent damage.
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 RAM module's compatibility with the motherboard
Why it's wrong here
When RAM is incompatible with the motherboard—wrong DDR generation, unsupported speed, or faulty timing—the CPU's memory controller fails during early pre-POST memory training. This results in beep codes, a locked black screen, or repeated power-on/off cycles before any code is executed; it does not let the system run for seconds and then switch off. A thermal shutdown happens after the processor begins sustained execution, whereas memory faults halt the POST process at the very beginning.
When this WOULD be correct
If the system powers on but fails to POST, emits beep codes, or exhibits random crashes and reboots, checking RAM compatibility would be appropriate. For example, when installing mismatched RAM speeds or types, the system may fail to initialize memory.
- ✗
The CPU power connector is fully seated
Why it's wrong here
The EPS/ATX 12V CPU power connector (typically 4+4 or 8-pin) delivers Vcore to the processor socket. If it were loose or unseated, the CPU would have no operating voltage, so the board would not complete startup—you'd see no video, no boot, and in most cases a full immediate shutdown or an overvoltage/reset cycle. A several-second delay followed by shutdown is the signature of a thermal event, not a missing power rail.
When this WOULD be correct
If the system showed no signs of power (no fans, no lights) and the technician had not yet verified the CPU power connector, checking that it is fully seated would be the first step.
- ✓
The thermal paste application between the CPU and heat sink
Why this is correct
Inadequate or missing thermal paste leaves microscopic air pockets between the CPU's integrated heat spreader and the cooler's base, severely reducing heat transfer. With no thermally conductive filler, the CPU's cores can reach critical temperature in seconds under even light load, tripping the motherboard's thermal shutdown protection. Therefore the system powers on briefly, then abruptly turns itself off to prevent permanent silicon damage.
- ✗
The front panel power switch connection
Why it's wrong here
The front panel power switch is a momentary-contact signal to the chipset, and a wiring error there would normally prevent the system from turning on at all, or make it instantly turn off when the switch is pressed. It cannot produce a controlled run-then-shut-down sequence several seconds after startup, because the power button circuit is only read at the moment of pressing or holding. The thermal protection path is completely separate and is what stops the machine in this scenario.
When this WOULD be correct
A technician builds a PC and presses the power button, but nothing happens. All other connections are verified. In that scenario, checking the front panel power switch connection would be the first step to ensure the power button is correctly wired to the motherboard header.
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.
✓The thermal paste application between the CPU and heat sinkCorrect answer▾
Why this is correct
Inadequate or missing thermal paste leaves microscopic air pockets between the CPU's integrated heat spreader and the cooler's base, severely reducing heat transfer. With no thermally conductive filler, the CPU's cores can reach critical temperature in seconds under even light load, tripping the motherboard's thermal shutdown protection. Therefore the system powers on briefly, then abruptly turns itself off to prevent permanent silicon damage.
✗The RAM module's compatibility with the motherboardWrong answer — click to see why▾
Why this is wrong here
The system powers on briefly and then shuts down, which is a classic sign of thermal shutdown due to poor heat transfer. RAM compatibility issues typically cause beep codes, boot loops, or no display, not a power-on-then-shutdown behavior.
★ When this WOULD be the correct answer
If the system powers on but fails to POST, emits beep codes, or exhibits random crashes and reboots, checking RAM compatibility would be appropriate. For example, when installing mismatched RAM speeds or types, the system may fail to initialize memory.
Why candidates choose this
Candidates often assume that any boot failure is related to RAM, as it's a common source of issues. They may overlook thermal problems because the CPU fan spins, giving a false sense that cooling is adequate.
✗The CPU power connector is fully seatedWrong answer — click to see why▾
Why this is wrong here
The CPU fan spins, indicating the motherboard is receiving power. The system shuts down after a few seconds, which is classic symptom of thermal shutdown due to poor heat transfer, not a missing CPU power connection.
★ When this WOULD be the correct answer
If the system showed no signs of power (no fans, no lights) and the technician had not yet verified the CPU power connector, checking that it is fully seated would be the first step.
Why candidates choose this
Candidates may assume that any power-related issue must be a loose connector, overlooking that the fan spin indicates power delivery is working.
✗The front panel power switch connectionWrong answer — click to see why▾
Why this is wrong here
The front panel power switch connection would cause the system not to power on at all, not to power on for a few seconds and then shut down. Since the system does power on briefly, the power switch is functioning.
★ When this WOULD be the correct answer
A technician builds a PC and presses the power button, but nothing happens. All other connections are verified. In that scenario, checking the front panel power switch connection would be the first step to ensure the power button is correctly wired to the motherboard header.
Why candidates choose this
Candidates may confuse symptoms of a power switch issue (no power) with a thermal shutdown (powers on then off), leading them to suspect the front panel connection even though the system does turn on.
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
Thermal Paste Application
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).
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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.