Troubleshooting No Display After Graphics Card Upgrade: Power Supply Issues
A technician is upgrading a gaming desktop with a new high-end graphics card that requires additional power. After installing the card and connecting the PCIe power cables from the 500W power supply, the system powers on but there is no display output when the monitor is connected to the graphics card. However, when the monitor is connected to the motherboard's integrated graphics port, the system boots normally. The technician has verified that the graphics card is properly seated and the PCIe power connectors are fully inserted. What is the MOST likely cause of this issue?
Quick Answer
The answer is an insufficient power supply wattage, as the 500W unit cannot deliver the peak power demanded by the new high-end graphics card. When a GPU doesn’t receive enough wattage, it fails to initialize its display output, even though the system fans spin and the motherboard’s integrated graphics work normally—this is because the card’s power-hungry components, like the GPU core and VRAM, require stable, high current under load, and a weak PSU causes voltage drops that prevent proper handshaking with the monitor. On the CompTIA A+ Core 1 220-1101 exam, this scenario tests your understanding of power supply sizing and the distinction between system power-on and component initialization; a common trap is assuming that if the system turns on and the card is seated, the PSU must be fine. Remember the memory tip: “If the fans spin but the screen stays black, check the wattage on the back.”
⚠ Common exam trap
Many candidates assume the system powering on and fans spinning means the PSU is adequate, but the GPU requires stable power under load to initialize its display output, and an underpowered PSU can still spin fans while failing to provide enough current for the GPU's core and memory.
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 power supply does not provide enough wattage for the graphics card
The most likely cause is that the 500W power supply does not provide enough wattage for the new high-end graphics card. High-end GPUs often have a high peak power draw that can exceed the total capacity of a 500W PSU, especially when the rest of the system (CPU, drives, fans) is also drawing power. When the GPU does not receive sufficient power, it may fail to initialize and output a display signal, even though the system powers on and the integrated graphics work fine.
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 graphics card is not fully seated in the PCIe slot
Why it's wrong here
The technician has already verified the card is properly seated, so reseating addresses a condition the stem rules out. Seating is the correct first check when a newly installed card is undetected entirely, before moving to power or firmware causes.
- ✓
The power supply does not provide enough wattage for the graphics card
Why this is correct
A 500W unit cannot sustain the card's peak draw plus the rest of the system, so the GPU fails to initialise and no display output appears, while integrated graphics still work. Insufficient wattage is the constraint the stem's verified seating and cabling rule out.
- ✗
The monitor cable is faulty
Why it's wrong here
The same cable and monitor work through the integrated port, so the cable itself is functional; a faulty cable would also break integrated output. Cable substitution is the right first step when no display appears on any output, not when one port works and another does not.
- ✗
The motherboard PCIe slot is damaged
Why it's wrong here
A dead PCIe slot would also prevent the card from being detected, but the stem already confirms the card is seated and powered; the symptom pattern points to insufficient PSU wattage under load. Slot damage is worth testing when a card fails in one slot yet works in another.
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Same concept, more angles
1 more way this is tested on 220-1101
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A technician is upgrading a desktop PC with a new graphics card that requires two 6-pin PCIe power connectors. The existing power supply unit (PSU) has two 6+2 pin PCIe cables. The technician connects both 6-pin connectors from the cables to the card. The system powers on, but the graphics card is not detected, and its fans spin briefly then stop. The technician has verified that the card is properly seated in the PCIe slot and that the PSU is rated for 500W, which should be sufficient for the system. Which of the following is the MOST likely cause of the issue?
hard- A.The 6+2 pin PCIe cables are not designed for the new card's power requirements.
- ✓ B.The PSU's +12V rail cannot provide enough current for the graphics card under load.
- C.The graphics card requires a single 12-pin connector, not two 6-pin connectors.
- D.The motherboard does not have a PCIe x16 slot that supports the card.
Why B: The 6+2 pin PCIe cables are electrically identical to 6-pin connectors when the extra 2 pins are detached, so they are fully compatible. The brief fan spin followed by stop indicates the graphics card is detecting insufficient power delivery, likely because the PSU's +12V rail cannot sustain the required current under load, causing the card's protection circuitry to shut down.
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.