Troubleshoot before replacing

A+ Core 1: Hardware and Network Troubleshooting
Original starter lesson / sources checked 2026-09-30

Start with the symptom, scope, and recent changes. Ask what works and what fails before replacing parts.

Check simple reversible causes first: power, cable connections, display selection, and known-good peripherals. Avoid opening equipment while energized.

Change one variable, verify the original symptom is resolved, and document the fix. A working boot is not enough if the original complaint was intermittent.

Hands-on lab

Use a spare or simulated workstation. Record a no-display symptom and list non-invasive checks before proposing a part replacement.
Write what evidence would justify each replacement and how you would verify the fix.

Put the lesson to work

Original exam-style practice. Choose the best answer for the stated scenario.

1. A desktop powers on, fans run, but its monitor is blank. What should you check FIRST?

The selected monitor input and cable connectionReplace the motherboard immediatelyReinstall the operating systemErase the boot drive

2. A repair appears to work. What completes the troubleshooting process?

Close the ticket without testingChange several more settingsVerify normal operation and document findings and actionsRemove all diagnostic logs

Go deeper

Official CompTIA scope and exam information

Independent practice aligned to selected topics. No endorsement, actual exam items, or pass guarantee. Verify your exam version and use the full official objectives for complete preparation.