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CCNA Motherboard Questions

30 questions · Motherboard · All types, answers revealed

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1
MCQmedium

A user complains that their PC sometimes fails to boot and displays a 'CMOS Checksum Error' message. After replacing the CMOS battery, the error persists. What motherboard component should you inspect next?

A.The CPU socket pins
B.The BIOS/UEFI chip
C.The RAM modules
D.The power supply unit
AnswerB

A failing BIOS chip or corrupted firmware can cause persistent checksum errors even with a good battery.

Why this answer

A CMOS checksum error indicates the BIOS settings are corrupted or not being saved. If a new battery doesn't fix it, the CMOS (RTC) chip itself may be failing, or the BIOS/UEFI firmware may need to be reset or updated. This points to a hardware issue on the motherboard beyond the battery.

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2
MCQhard

A technician is troubleshooting a high-end workstation that randomly freezes during heavy 3D rendering. The motherboard has an X299 chipset with an LGA 2066 socket. The CPU temperature is normal, and the RAM passes MemTest86. Which motherboard component is most likely causing the instability?

A.The CPU power phase controller
B.The chipset heatsink is clogged with dust
C.The BIOS is outdated
D.The PCIe slot is failing
AnswerB

An overheating chipset can cause random freezes during heavy I/O operations, as the chipset throttles or fails under thermal stress.

Why this answer

Random freezes under heavy load, with normal CPU temps and good RAM, often point to the chipset overheating. The chipset (e.g., X299) manages high-speed data transfer between the CPU, GPU, and storage; if its heatsink is clogged or the fan fails, it can overheat and cause system instability. This is a common issue in workstations with heavy I/O demands.

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3
MCQeasy

A user complains that their computer sometimes fails to boot and emits a series of long beeps. After several attempts, it boots normally. Which motherboard component is most likely failing?

A.The CPU
B.The power supply
C.The RAM modules
D.The hard drive
AnswerC

Long beeps are a standard BIOS code for RAM errors; intermittent failures suggest a loose or failing module.

Why this answer

A series of long beeps during POST typically indicates a memory (RAM) issue. Intermittent boot failures with beep codes point to a failing RAM module, a dirty contact, or a loose connection. The beep code is a diagnostic tool from the motherboard's BIOS.

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4
MCQeasy

During a routine hardware upgrade, you install a new PCIe x16 graphics card into a desktop motherboard. The system powers on, but the display remains blank. The graphics card's fans are spinning. What should you check first on the motherboard?

A.The BIOS settings for primary display adapter
B.The monitor cable is connected to the graphics card, not the motherboard
C.The graphics card power connectors are properly attached
D.The PCIe slot is damaged
AnswerB

If the monitor is plugged into the motherboard's integrated graphics port, the system will show no display because the motherboard disables integrated graphics when a dedicated card is detected.

Why this answer

When a dedicated graphics card is installed, the motherboard often disables the integrated graphics port. If the monitor is still connected to the motherboard's video output, it will remain blank. The first step is to ensure the monitor cable is connected to the new graphics card's ports.

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5
MCQeasy

A technician is upgrading a workstation from DDR3 to DDR4 memory. The motherboard currently has two DDR3 DIMM slots occupied. What must the technician verify before installing the new memory?

A.The CPU supports DDR4 memory
B.The motherboard has DDR4 DIMM slots
C.The power supply has a 4-pin connector for memory
D.The chipset supports dual-channel configuration
AnswerB

DDR4 memory requires physically different slots; installing DDR4 into a DDR3 board is impossible due to different notch positions and keying.

Why this answer

DDR3 and DDR4 have different notch positions and voltage requirements, so they are not interchangeable. The motherboard must physically support DDR4, which means it must have DDR4 DIMM slots. The CPU socket type and chipset are secondary; the key factor is the motherboard's memory generation support.

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6
MCQmedium

A technician is troubleshooting a PC that randomly restarts under load. The CPU temperature is normal, but the system sometimes fails to POST with a 'CPU Overvoltage Error'. The motherboard is a few years old. What is the most likely cause?

A.The CPU is overheating due to a failing cooler
B.The power supply is delivering too much voltage
C.The motherboard VRM is failing
D.The BIOS needs to be updated to support the CPU
AnswerC

A failing VRM can cause voltage spikes or incorrect readings, triggering overvoltage protection.

Why this answer

A 'CPU Overvoltage Error' typically indicates the motherboard's voltage regulation module (VRM) is failing or the BIOS is incorrectly applying voltage. Aging VRMs can become unstable, causing overvoltage protection to trigger. This is a motherboard hardware fault, not a CPU issue.

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7
MCQhard

A user reports that their PC's USB 3.0 ports are only operating at USB 2.0 speeds. The device works fine on another computer. The motherboard has both USB 3.0 and USB 2.0 headers. What is the most likely cause?

A.The USB 3.0 controller driver is not installed
B.The USB cable is too long
C.The front panel USB 3.0 header is loose
D.The motherboard's USB 3.0 controller is faulty
AnswerA

Without the correct driver, the USB 3.0 ports will default to USB 2.0 speeds.

Why this answer

USB 3.0 ports require a dedicated controller and proper driver support. If the USB 3.0 driver is missing or the controller is disabled in BIOS, the ports will fall back to USB 2.0 speeds. This is a common issue after a fresh OS install or BIOS reset.

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8
MCQhard

A technician is troubleshooting a PC that randomly freezes during boot. The technician notices that the motherboard has a 24-pin ATX power connector and an 8-pin EPS12V connector. The power supply only has a 4+4 pin CPU power cable. What should the technician do?

A.Connect only the 4-pin portion of the cable to the 8-pin header
B.Combine the two 4-pin halves to form an 8-pin connector and attach it
C.Use a 6-pin PCIe power cable in the 8-pin CPU header
D.Leave the 8-pin header unconnected and rely on the 24-pin connector
AnswerB

The 4+4 pin cable is specifically designed to be combined into an 8-pin EPS12V connector, providing full power to the CPU.

Why this answer

The 4+4 pin CPU power cable is designed to be used as an 8-pin EPS12V connector by combining the two halves. This is standard for modern power supplies. Using only a 4-pin connector may cause instability under load, but the 4+4 pin cable is fully compatible.

The 24-pin main connector is separate and already connected.

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9
MCQmedium

A technician is troubleshooting a PC that fails to boot and emits a series of long beeps. The motherboard documentation indicates this is a memory error. Which component on the motherboard is responsible for generating these beep codes?

A.CMOS battery
B.BIOS/UEFI chip
C.Chipset
D.Super I/O chip
AnswerB

The BIOS/UEFI firmware runs POST and outputs beep codes through the speaker to indicate hardware faults like memory errors.

Why this answer

The BIOS/UEFI firmware is responsible for the Power-On Self-Test (POST) and uses the speaker to emit beep codes to indicate hardware errors. The CMOS battery only retains settings, the chipset handles data flow, and the Super I/O manages I/O but not POST beep codes.

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10
MCQeasy

A customer reports that their computer will not power on. The power supply fan does not spin, and the motherboard's power LED is off. You have verified the power cord and outlet are working. Which motherboard component is most likely causing this issue?

A.Faulty CMOS battery
B.Failed motherboard power-on circuit
C.Loose front panel power switch connector
D.Incorrect BIOS settings
AnswerB

A failed power-on circuit on the motherboard can prevent the PSU from receiving the signal to start, causing no power to the system.

Why this answer

The motherboard's power LED not lighting up and the PSU fan not spinning indicate a lack of standby power, which is typically supplied through the CMOS battery or the PSU itself. However, a failed CMOS battery can prevent the system from retaining BIOS settings, but it does not usually stop the PSU from providing standby power. The most common cause in this scenario is a failed power supply, but since the question focuses on the motherboard, a shorted motherboard or a failed power-on circuit is the likely culprit.

The correct answer is a failed motherboard power-on circuit, as it can prevent the PSU from turning on even if the PSU is functional.

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11
MCQmedium

A user reports that their PC randomly shuts down after about 30 minutes of use. You suspect a thermal issue. Which motherboard component is most directly responsible for monitoring CPU temperature and initiating a shutdown if it exceeds safe limits?

A.BIOS/UEFI firmware
B.Chipset (PCH)
C.Super I/O chip
D.Voltage regulator module (VRM)
AnswerC

The Super I/O chip integrates thermal sensor inputs and can assert a hardware reset or shutdown signal to protect the CPU from overheating.

Why this answer

The Super I/O chip is responsible for monitoring hardware sensors, including CPU temperature, and can trigger a hardware-level shutdown if thresholds are exceeded. The BIOS/UEFI configures these thresholds, but the actual monitoring is done by the Super I/O. The chipset and voltage regulator module do not perform thermal monitoring.

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12
MCQmedium

You are building a workstation for video editing and need to install a dedicated GPU in the primary PCIe x16 slot. After installation, the system boots but the GPU is not detected in Device Manager. The GPU works fine in another PC. What should you check on the motherboard?

A.The PCIe slot's power delivery from the PSU
B.The motherboard's BIOS setting for the PCIe slot
C.The CMOS battery voltage
D.The CPU fan header
AnswerB

The slot may be disabled or set to a different generation; checking BIOS configuration is essential.

Why this answer

If the GPU is not detected, the most likely motherboard-related cause is that the PCIe slot is disabled in BIOS or the slot itself is faulty. Another possibility is that the slot is configured for a different device (e.g., an M.2 drive sharing lanes). Verifying BIOS settings is the first step.

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13
MCQhard

A technician is replacing a failed motherboard in a desktop PC. The original motherboard had an LGA1151 socket. The replacement motherboard has an LGA1200 socket. The technician attempts to install the original CPU but finds it does not fit. What is the most likely reason?

A.The CPU is incompatible with the new motherboard's chipset
B.The CPU has a different number of pins
C.The power supply connector is different
D.The CPU is an AMD processor
AnswerB

LGA1151 CPUs have 1151 pins, while LGA1200 has 1200; the different pin count and layout prevent physical installation.

Why this answer

LGA sockets are keyed for specific generations of CPUs. LGA1151 is used for 6th/7th/8th/9th gen Intel, while LGA1200 is for 10th/11th gen. The physical pin count and keying are different, so a CPU designed for LGA1151 cannot be inserted into an LGA1200 socket.

The chipset is irrelevant to physical fit, and the power connector is unrelated.

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14
MCQmedium

You are deploying 20 identical office PCs. After imaging one system, you clone the drive to the other 19. However, all cloned systems fail to boot with a 'Boot Device Not Found' error. The original system boots fine. What motherboard setting is most likely causing this?

A.Secure Boot is enabled on the clones
B.The SATA mode is set to AHCI on the clones
C.The boot mode is set to Legacy BIOS instead of UEFI
D.The CMOS battery is dead on the clones
AnswerC

If the cloned drive uses UEFI boot, the motherboard must be set to UEFI mode; Legacy mode will not detect the UEFI boot partition.

Why this answer

When cloning a system, the boot mode (UEFI vs. Legacy BIOS) must match the motherboard configuration. If the original was set to UEFI but the clones have Legacy mode enabled (or vice versa), the system won't find the bootloader.

This is a common deployment pitfall.

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15
MCQeasy

A client wants to upgrade their desktop PC with a new, faster processor. They have purchased a CPU that is listed as compatible with the motherboard's socket type. After installation, the system powers on but displays a blank screen. What is the most likely issue?

A.The CPU is not seated properly
B.The motherboard BIOS needs an update
C.The RAM is incompatible with the new CPU
D.The power supply is insufficient
AnswerB

A BIOS update is often required to support newer CPU models, even if the socket is physically compatible; without it, the system may power on but not post.

Why this answer

Even if the CPU fits the socket, the motherboard's BIOS/UEFI may require an update to support a newer CPU model. This is a common scenario where the hardware is physically compatible but the firmware is outdated. The system powers on but fails to post because the BIOS does not recognize the CPU.

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16
MCQmedium

A technician is building a new gaming PC. The motherboard has two PCIe x16 slots, but the graphics card only works in the second slot. When installed in the first slot (closest to the CPU), the system powers on but no display. What is the most likely cause?

A.The graphics card is not fully seated in the first slot
B.The first PCIe slot is disabled in BIOS
C.The power supply is insufficient for the first slot
D.The CPU has bent pins affecting the first slot
AnswerB

Some motherboards allow disabling individual PCIe slots; if the first slot is disabled, the card will not work there but will work in an enabled slot.

Why this answer

This scenario often occurs when the first PCIe x16 slot shares bandwidth with other components or is configured differently in BIOS. However, a common issue is that the first slot may require a specific BIOS setting, or the slot itself is damaged. The most likely cause is that the motherboard's BIOS is set to use the second slot as the primary display, or the first slot is faulty.

Since the card works in the second slot, the first slot is likely the problem.

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17
MCQmedium

A customer wants to add a dedicated graphics card to their PC for gaming. The motherboard has one PCIe x16 slot, but it is currently occupied by a Wi-Fi card. The customer asks if they can use the PCIe x1 slot for the graphics card. What should the technician advise?

A.Yes, but the graphics card will run at reduced performance
B.Yes, but only if the motherboard supports SLI
C.No, the graphics card requires a PCIe x16 slot
D.No, because the Wi-Fi card must stay in the x16 slot
AnswerC

Graphics cards are designed for PCIe x16 slots; using a smaller slot would not physically fit and would severely bottleneck performance.

Why this answer

PCIe x1 slots are physically shorter and provide only one lane of bandwidth, which is insufficient for a modern graphics card's performance needs. A graphics card requires a PCIe x16 slot (electrically x8 or x16) for adequate data transfer. The Wi-Fi card can be moved to the x1 slot, but the graphics card must go in the x16 slot.

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18
MCQhard

A technician is replacing a faulty motherboard in a workstation. After installing the new board, the system powers on but there is no display output from the integrated graphics port. The CPU does not have integrated graphics. What should the technician do?

A.Clear the CMOS to reset BIOS settings
B.Install a dedicated GPU into a PCIe slot
C.Update the motherboard BIOS
D.Check the monitor cable connection
AnswerB

Since the CPU has no integrated graphics, a dedicated GPU is required for display output.

Why this answer

If the CPU lacks integrated graphics, the motherboard's video output ports will not function. A dedicated GPU must be installed. This is a common oversight when switching from a CPU with integrated graphics to one without.

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19
MCQhard

During a motherboard replacement, you install the new board and connect all cables. When you power on, the system beeps continuously (long beeps). The CPU fan spins, but there is no display. What is the most likely cause?

A.The CPU is not compatible with the new motherboard
B.The RAM is not seated correctly or is faulty
C.The power supply is underpowered
D.The motherboard is shorting against the case
AnswerB

Continuous long beeps are a common BIOS code for memory failure; reseating or replacing the RAM is the first step.

Why this answer

Continuous long beeps typically indicate a memory (RAM) issue. This could be due to improperly seated RAM, incompatible memory, or a faulty memory slot. The CPU fan spinning suggests power is reaching the board, but the POST process halts at memory initialization.

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20
MCQmedium

During a hardware installation, a technician needs to connect the front panel USB 3.0 ports of a new case to the motherboard. The motherboard has a 20-pin USB 3.0 header. Which cable from the case should be connected to this header?

A.A 9-pin USB 2.0 cable
B.A 4-pin power LED cable
C.A 10-pin audio cable
D.A 20-pin (19-pin) USB 3.0 cable
AnswerD

This cable matches the motherboard's USB 3.0 header, providing data connectivity for the front USB 3.0 ports.

Why this answer

The USB 3.0 internal header is a 20-pin (or 19-pin) connector that carries data for up to two USB 3.0 ports. The case's USB 3.0 cable will have a matching connector. USB 2.0 headers are 9-pin, and the audio header is different.

The power LED is a separate 2-pin connector.

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21
MCQeasy

During a desktop build, you install a new M.2 NVMe SSD into the M.2 slot. When you power on the system, the BIOS does not detect the drive. The SSD is known to be working. What is the most likely motherboard-related cause?

A.The M.2 slot is SATA-only and the drive is NVMe
B.The CMOS battery needs replacement
C.The motherboard BIOS is corrupted
D.The CPU is not seated properly
AnswerA

Some M.2 slots only support SATA protocol; an NVMe drive will not be detected in such a slot.

Why this answer

Many motherboards share PCIe lanes between M.2 slots and SATA ports. Installing an M.2 NVMe drive often disables certain SATA ports, but the drive itself should still be detected if properly seated. The most common oversight is not checking the motherboard manual for M.2 slot compatibility or lane sharing.

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22
MCQhard

A technician is tasked with connecting a legacy parallel port printer to a modern motherboard that lacks a parallel port header. The motherboard has an LPT header (25-pin) but it is not populated with a bracket. What is the best way to add a parallel port?

A.Install a USB-to-parallel adapter
B.Use a PCIe parallel port expansion card
C.Purchase an LPT bracket that connects to the motherboard header
D.Solder wires directly to the motherboard's LPT header pins
AnswerC

This bracket provides the physical port using the motherboard's built-in parallel port header, which is the most direct and cost-effective solution.

Why this answer

The LPT header on the motherboard provides the necessary signals for a parallel port. A bracket with a ribbon cable that connects to this header is the correct solution. A USB-to-parallel adapter would work but may have compatibility issues and is not the best use of the existing header.

A PCIe parallel card is an alternative but unnecessary if the header is present.

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23
MCQeasy

You are upgrading a customer's gaming PC to support faster memory. The motherboard supports DDR4-3200, but after installing two 8GB DDR4-3200 modules, the system only runs at 2133 MHz. What is the most likely reason?

A.The RAM modules are defective
B.The motherboard does not support dual-channel memory
C.XMP is not enabled in the BIOS
D.The CPU does not support DDR4-3200
AnswerC

XMP must be enabled to run RAM above the default JEDEC speed; this is a common configuration step.

Why this answer

By default, most motherboards run RAM at a standard JEDEC speed (often 2133 MHz) for stability. To achieve the rated speed of 3200 MHz, you must enable XMP (Extreme Memory Profile) in the BIOS. This is a common step that new builders overlook.

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24
MCQmedium

A technician is building a PC for video editing and wants to install 32 GB of RAM using four 8 GB modules. The motherboard supports dual-channel memory. Which DIMM slot configuration should the technician use to achieve the best performance?

A.Install all four modules in the same channel (e.g., A1, A2, A3, A4)
B.Install two modules in channel A and two in channel B
C.Install one module in each channel, leaving two slots empty
D.Install three modules in channel A and one in channel B
AnswerB

This configuration utilizes both memory channels, enabling dual-channel mode for maximum bandwidth.

Why this answer

For dual-channel memory with four modules, the motherboard typically uses slots A1, A2, B1, and B2. To enable dual-channel, matching pairs must be in the same channel (e.g., A1 and A2 for channel A, B1 and B2 for channel B). Installing all four modules in the same channel would force single-channel operation, halving memory bandwidth.

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25
MCQeasy

A customer reports that their desktop PC will not power on at all. The power supply fan does not spin, and no LEDs light up. You have verified the wall outlet is working. Which motherboard component is most likely preventing the system from starting?

A.CMOS battery
B.Front panel header
C.Chipset heatsink
D.CPU socket
AnswerB

The front panel header carries the power switch connection; a loose or faulty connection here can prevent the motherboard from receiving the power-on signal.

Why this answer

The CMOS battery is not involved in the power-on process; it only maintains BIOS settings. The chipset and CPU are not directly responsible for the initial power-up sequence. The power-on process begins with the power button connecting to the front panel header, and if that connection is faulty, the motherboard never receives the signal to start the PSU.

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26
MCQmedium

A technician is tasked with upgrading the RAM in a desktop motherboard that has four DIMM slots. The existing configuration has two 4GB sticks in slots A1 and B1. The user wants to add two more 4GB sticks for a total of 16GB. After installing the new sticks in slots A2 and B2, the system boots but only shows 8GB of RAM. What is the most likely cause?

A.The new RAM is not seated properly
B.The motherboard does not support four sticks of RAM
C.The new RAM is incompatible with the existing RAM
D.The BIOS needs an update to support higher capacity
AnswerC

Mismatched RAM modules can cause the system to only recognize the original pair, as the motherboard may fail to train all four modules together.

Why this answer

When mixing RAM modules, even if they are the same size, they may not be compatible if they have different timings, speeds, or ranks. The motherboard may default to the lowest common denominator or fail to recognize mismatched modules. This is a common issue when not using matched kits.

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27
MCQmedium

A user reports that their computer will not boot and the motherboard's diagnostic LEDs show a CPU error. You reseat the CPU and check for bent pins, but the error persists. Which of the following should you check next?

A.The RAM modules are in the correct slots
B.The motherboard's BIOS is corrupted
C.The CPU power cable is not fully connected
D.The CPU cooler is installed incorrectly
AnswerC

If the 8-pin CPU power connector is loose or disconnected, the CPU will not receive power, causing the motherboard to indicate a CPU error.

Why this answer

A CPU error LED can indicate several issues, including power delivery problems. The 8-pin CPU power connector is often overlooked; if it is loose or not connected, the CPU will not receive power, triggering the error. This is a common mistake during builds or after cleaning.

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28
MCQeasy

A customer reports that their desktop PC will not power on at all. The power supply fan does not spin, and no LEDs are lit. You have verified the power cord is good and the outlet has power. Which motherboard component should you check first?

A.The CMOS battery
B.The front panel power switch header
C.The 24-pin ATX power connector
D.The CPU fan header
AnswerC

This is the primary power connection from the PSU to the motherboard; if loose, no power reaches the board.

Why this answer

The ATX power connector (main power connector) supplies power from the PSU to the motherboard. If it is loose or disconnected, the motherboard will not receive power, causing a no-power condition. Always check this first before assuming PSU failure.

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29
MCQhard

A server motherboard in a data center fails to boot after a power outage. The system has dual power supplies and ECC RAM. When power is restored, the motherboard's POST beeps continuously in a pattern that does not match any known code for that manufacturer. Which component is most likely causing this issue?

A.One of the power supplies is faulty
B.The motherboard's VRM has been damaged by a power surge
C.The ECC RAM has detected an uncorrectable error
D.The CMOS battery has been depleted
AnswerB

A damaged VRM can cause irregular power delivery to the CPU and other components, resulting in non-standard beep codes and failure to boot.

Why this answer

Continuous beeps that do not match standard codes often indicate a power-related issue, such as a failed voltage regulator module (VRM) on the motherboard. Power surges can damage the VRM circuitry, leading to erratic POST behavior. The dual PSUs may be fine, but the motherboard's power regulation has failed.

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30
MCQmedium

A small office has a desktop PC that will not display any video. The motherboard has an integrated VGA port and a PCIe x16 slot that is empty. The system powers on, fans spin, but the monitor connected to the VGA port shows 'No Signal'. What is the most likely cause?

A.The monitor is faulty
B.The CPU lacks integrated graphics
C.The RAM is not properly seated
D.The motherboard's CMOS battery is dead
AnswerC

Without working RAM, the motherboard cannot complete POST, and no video output is generated, even if the CPU and integrated graphics are functional.

Why this answer

If no dedicated GPU is installed and the integrated graphics are not working, the issue could be that the CPU does not have integrated graphics, or the integrated graphics are disabled in BIOS. However, the most common cause when the system powers on but no video is that the RAM is not properly seated or is faulty, as the system cannot complete POST without working memory.

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