- A
The new RAM module is incompatible with the laptop's chipset
Incompatible or improperly seated RAM can cause POST failures that produce beep codes. Some motherboards map memory errors to video-related beep codes. The timing (after RAM install) strongly suggests this.
- B
The laptop's display cable has become disconnected
Why wrong: A disconnected display cable would cause a blank screen but not beep codes. The beeps indicate a hardware failure detected during POST.
- C
The laptop's CMOS battery is dead
Why wrong: A dead CMOS battery can cause time/date errors but typically does not produce beep codes or prevent the system from posting.
- D
The user accidentally damaged the motherboard when installing the RAM
Why wrong: While possible, this is less likely than simple incompatibility or improper seating. The beep code is a specific indicator that the system is detecting a hardware issue, often related to the newly installed component.
Quick Answer
The answer is that the new RAM module is incompatible with the laptop’s chipset. When a laptop emits one long and two short beeps after RAM installation, it is a common BIOS POST code that typically signals a video or display adapter failure, but because the problem began immediately after adding memory, the root cause is almost certainly a memory-related failure that some systems misinterpret as a video error. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your ability to correlate beep codes with recent hardware changes rather than jumping to a graphics card diagnosis—a classic trap where the symptom points one way but the trigger points another. Remember that POST codes are motherboard-specific, so always consider the sequence of events: if beeps follow a RAM upgrade, suspect incompatibility or improper seating before blaming the display. A useful memory tip: “One long, two short? Check the RAM you just brought.”
220-1101 Mobile Devices Troubleshooting Practice Question
This 220-1201 practice question tests your understanding of mobile devices troubleshooting. 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 technician is troubleshooting a laptop that emits a series of beeps (one long, two short) on startup and displays nothing on the screen. The laptop was working fine until the user installed a new RAM module. What is the most likely cause?
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 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 new RAM module is incompatible with the laptop's chipset
One long and two short beeps is a common BIOS POST code indicating a video or display adapter issue. However, since the problem started after installing RAM, it is likely that the RAM module is incompatible or not seated properly, causing a memory-related POST failure that manifests as a video error code on some systems.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 new RAM module is incompatible with the laptop's chipset
Why this is correct
Incompatible or improperly seated RAM can cause POST failures that produce beep codes. Some motherboards map memory errors to video-related beep codes. The timing (after RAM install) strongly suggests this.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The laptop's display cable has become disconnected
Why it's wrong here
A disconnected display cable would cause a blank screen but not beep codes. The beeps indicate a hardware failure detected during POST.
- ✗
The laptop's CMOS battery is dead
Why it's wrong here
A dead CMOS battery can cause time/date errors but typically does not produce beep codes or prevent the system from posting.
- ✗
The user accidentally damaged the motherboard when installing the RAM
Why it's wrong here
While possible, this is less likely than simple incompatibility or improper seating. The beep code is a specific indicator that the system is detecting a hardware issue, often related to the newly installed component.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
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Mobile Devices Troubleshooting — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Devices Troubleshooting — This question tests Mobile Devices Troubleshooting — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The new RAM module is incompatible with the laptop's chipset — One long and two short beeps is a common BIOS POST code indicating a video or display adapter issue. However, since the problem started after installing RAM, it is likely that the RAM module is incompatible or not seated properly, causing a memory-related POST failure that manifests as a video error code on some systems.
What should I do if I get this 220-1201 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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.
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