A technician is troubleshooting a desktop computer that displays no power LEDs and produces no fan rotation when the power button is pressed. Arrange the troubleshooting steps below in the correct order, from the initial basic physical checks to final component replacement.
- 1Verify that the wall outlet is providing power and that the PSU rear rocker switch is flipped to the ON position.
- 2Inspect and reseat the 24-pin main ATX and 8-pin EPS power connectors on the motherboard.
- 3Disconnect internal power cables and test the power supply output rail voltages using a PSU tester.
- 4Replace the motherboard after confirming the power supply delivers normal voltage readings across all rails.
Answer
The correct sequence is: 1) Verify wall outlet power and the PSU rear rocker switch, 2) Inspect and reseat the 24-pin ATX and 8-pin CPU power connectors on the motherboard, 3) Disconnect internal power cables and test PSU output rail voltages using a PSU tester, and 4) Replace the motherboard after confirming normal PSU voltage output.
Following standard troubleshooting methodology, a technician must always start with the simplest, least invasive external checks (verifying AC outlet power and the rear PSU switch), then progress to internal cable seating, followed by diagnostic testing of the power supply using a tester, and finally replacing the motherboard once the PSU has been verified functional.
Step-by-Step Solution
Key Concept
CompTIA hardware troubleshooting methodology for complete power failure scenarios.
Estimated Time:1m 0s