Study PC Power, Boot, Storage and Display Issues for A+ Core 1 (220-1201)
Diagnose common desktop and laptop symptoms involving no power, boot failures, storage detection, and display problems on A+ Core 1.
This lesson covers the support symptoms that make up a large share of Core 1 troubleshooting questions. The exam wants you to classify whether the failure is power, startup, storage, or display related before you start replacing parts.
POST: Power-on self-test, the early hardware check that happens before the normal boot path continues.
What CompTIA is really testing
CompTIA usually wants you to:
- distinguish no power from no boot from no display
- recognize storage-detection and startup clues
- know which simple checks should happen before deep repair
Fast symptom map
| Symptom | Strong first direction |
|---|---|
| no lights, no fans | power source, cable, PSU, battery, outlet |
| powers on but will not boot | boot order, storage detection, firmware, startup path |
| drive missing | cable, seating, firmware detection, interface support |
| black screen but system seems active | display cable, input source, backlight, GPU or display path |
Classify the failure boundary first
| Failure type | What it usually means |
|---|---|
| no power | the system is not starting the electrical path at all |
| powers on, no POST | startup fails very early, often around board, CPU, RAM, or firmware clues |
| POST succeeds, no boot | storage or boot-path issue after hardware initialization |
| boots, no visible image | display path or graphics issue rather than total startup failure |
Evidence beats guessing
Support questions often reward the candidate who notices the exact failure boundary:
- no power is lower than no boot
- no display does not always mean the system failed to start
- missing storage may be compatibility, cable, or firmware configuration
Practical first checks
1Power symptom -> verify source, cable, battery, PSU path
2Startup symptom -> note lights, fan behavior, beeps, or firmware messages
3Storage symptom -> verify detection before formatting or reinstalling
4Display symptom -> verify monitor input, cable path, and known-good display path
Harder scenario question
A desktop powers on, fans spin, and the keyboard lights flash, but the screen stays black after a new graphics card install. Another answer choice suggests reinstalling the operating system.
The better answer usually:
- stays in the display or expansion lane first
- checks monitor input, cabling, card seating, and power connectors
- avoids OS repair because the system has not even proved that video output is stable
What strong answers usually do
- start with power path and physical checks
- separate startup from video-only issues
- verify detection before reinstalling or replacing unrelated parts
- use the symptom boundary to eliminate overdramatic fixes