The answer is an internal short or faulty keyboard controller, as this is the most likely hardware issue when a laptop keyboard types random characters without any physical damage or liquid spill. This occurs because the keyboard matrix relies on a grid of circuits to register each keypress; a short circuit or a failing controller can send incorrect signals to the system, causing it to interpret a single press as multiple or random characters. On the CompTIA A+ Core 1 220-1201 exam, this question tests your ability to distinguish between hardware failures and software or driver issues—a common trap is to suspect malware or sticky keys, but the absence of spills or drops points directly to the keyboard assembly itself. Remember the memory tip: “Short circuit, wrong circuit”—if the keyboard types gibberish and the laptop is clean, the controller or matrix is the culprit, and replacement is the standard fix.
220-1101 Mobile Device Hardware Servicing Practice Question
This 220-1201 practice question tests your understanding of mobile device hardware servicing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A user reports that their laptop's keyboard types random characters when certain keys are pressed. The laptop has not been dropped or spilled on. What is the most likely hardware issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The keyboard has an internal short or faulty controller.
A faulty keyboard controller or a short in the keyboard matrix can cause random character output. This is a hardware failure within the keyboard assembly. Replacing the keyboard is the standard fix, as individual key repairs are not practical.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 keyboard driver is corrupted.
Why it's wrong here
Driver issues typically cause no response or wrong characters from specific keys, not random characters from unrelated keys.
✗
The keyboard ribbon cable is loose.
Why it's wrong here
A loose cable would cause some keys to not work or intermittent failure, not random character output.
✓
The keyboard has an internal short or faulty controller.
Why this is correct
An internal short can cause ghost key presses, leading to random characters. Replacement is necessary.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The operating system has a malware infection.
Why it's wrong here
Malware can simulate keystrokes, but it would usually produce consistent patterns, not random characters on key press.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
A loose cable would cause some keys to not work or intermittent failure, not random character output.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Mobile Device Hardware Servicing — This question tests Mobile Device Hardware Servicing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The keyboard has an internal short or faulty controller. — A faulty keyboard controller or a short in the keyboard matrix can cause random character output. This is a hardware failure within the keyboard assembly. Replacing the keyboard is the standard fix, as individual key repairs are not practical.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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