Practice 220-1201 Display Devices Troubleshooting questions with full explanations on every answer.
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A user's 4K monitor is set to 3840x2160 resolution but text and icons appear very small and blurry. The display cable is a standard HDMI cable. What is the most likely cause of the blurriness?
2A technician is setting up a dual-monitor workstation. One monitor is connected via DisplayPort, the other via DVI. The DVI monitor is not detected. The DisplayPort monitor works fine. Which of the following is the most likely cause?
3A technician is troubleshooting a display that shows a single vertical line of dead pixels from top to bottom. The monitor is under warranty. Which of the following is the most appropriate resolution?
4A user reports that their LCD monitor intermittently goes black for 2-3 seconds, then returns to normal. This happens randomly, not during any specific activity. The monitor's power LED stays green during the blackouts. Which component is most likely failing?
5A customer complains that their LCD monitor has a persistent faint shadow of the previous image visible on the screen, even after changing applications. What is the most likely cause of this issue?
6A technician is troubleshooting a desktop PC that powers on but shows no display on the monitor. The monitor's power LED is amber (standby). The PC has an integrated GPU and a discrete GPU. Which step should be taken FIRST to isolate the issue?
7A user reports that their external monitor connected via HDMI displays a 'No Signal' message, though the monitor power LED is lit. The laptop's built-in display works fine. Which of the following should be checked FIRST?
8A user's projector displays a very dim image, even with the brightness setting at maximum. The lamp hour counter shows 1500 hours, and the projector is three years old. What is the most likely cause?
9After installing a new graphics card, a user's display shows distorted colors and random artifacts during boot. The system POSTs successfully. Which of the following is the most likely cause?
10A user reports that their laptop screen flickers intermittently, but the flickering stops when they adjust the screen angle. What is the most likely hardware issue?
11During a hardware installation, you connect a new 4K monitor to a desktop PC using DisplayPort, but the display is stuck at 1080p resolution. The graphics card supports 4K. What is the most likely cause?
12A user complains that their LCD monitor has a persistent dark spot in the center of the screen that does not change with different images. What is the most likely issue?
13A user reports that their laptop's built-in display shows a dim image that is barely visible even at maximum brightness. An external monitor works perfectly. The laptop uses an LED-backlit screen. What component is most likely failing?
14A technician is troubleshooting a display that shows a 'ghost' image of a previous screen that fades slowly. The monitor is a 4-year-old IPS panel. What is the most likely cause?
15A technician is troubleshooting a display that shows vertical lines across the entire screen. The lines persist when a different video cable is used, and the monitor works fine when connected to another computer. What is the most likely cause?
16During a hardware upgrade, you install a new high-end graphics card and connect a 144Hz gaming monitor via DisplayPort. The monitor is set to 144Hz in Windows, but the screen occasionally goes black for a few seconds during gameplay. What is the most likely cause?
17A technician is configuring a dual-monitor setup for a financial analyst. Both monitors are identical 27-inch 1440p displays. After connecting them, one monitor shows a pink tint across the entire screen. What is the most likely cause?
18A user reports that their laptop screen flickers intermittently, especially when the lid is moved. The flickering stops when an external monitor is connected. What is the most likely cause?
19A customer reports that their external monitor connected via HDMI to a laptop shows a 'No Signal' message, even though the laptop screen works fine. The monitor has been tested with another device and works. What should you check first?
20A customer brings in a desktop PC with a 4K monitor that displays a blurry image at native resolution. The monitor's settings show 3840x2160 resolution, but text is hard to read. What is the most likely issue?
21A customer brings in an all-in-one PC that has a cracked LCD screen. The touch function still works, but the display shows a large black area with spiderweb cracks. The customer wants the cheapest fix. What should you recommend?
22A user reports that their external monitor connected via USB-C (DisplayPort Alt Mode) works intermittently. When it does work, the resolution is limited to 1920x1080 even though the monitor supports 4K. The laptop supports USB-C with DisplayPort Alt Mode. What is the most likely cause?
23A technician is setting up a new 32-inch 4K monitor for a graphic designer. After connecting it via HDMI, the display shows a 'Signal Out of Range' error. The PC has an integrated Intel GPU. What is the most likely cause?
24During a hardware install, you connect a new 4K monitor to a desktop PC using an HDMI cable. The display shows a 'No Signal' message. The PC boots normally and the monitor is powered on. What is the most likely cause?
25A technician is troubleshooting a desktop PC that displays vertical colored lines across the screen immediately after booting. The lines appear even before the operating system loads. What is the most likely cause?
26A user reports that their laptop screen suddenly went black, but the laptop is still powered on (fans running, power light on). Connecting an external monitor shows the desktop correctly. What is the most likely cause?
27A customer complains that their LCD monitor shows a persistent dark shadow in the upper-left corner that does not change with different input sources. The monitor is three years old. What is the most likely cause?
28A user has a 27-inch 1440p monitor connected via DisplayPort. They report that text appears slightly blurry and images look less sharp than expected. The monitor's native resolution is set correctly in Windows. What should you check first?
29A user reports that their external monitor connected to a laptop via HDMI flickers intermittently. The laptop's built-in display works fine. You have tried a different HDMI cable and a different monitor, but the flickering persists. What should you check next?
30You are configuring a dual-monitor setup for a financial analyst. After connecting both monitors, one display shows a distorted, stretched image while the other works perfectly. Both monitors are identical 1920x1080 models. What is the most efficient troubleshooting step?
The Display Devices Troubleshooting domain covers the key concepts tested in this area of the 220-1201 exam blueprint published by CompTIA. Courseiva provides free domain-focused practice, mock exams, missed-question review, and readiness tracking across all 220-1201 domains — no account required.
The Courseiva 220-1201 question bank contains 30 questions in the Display Devices Troubleshooting domain. Click any question to see the full explanation and answer breakdown.
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