A technician is troubleshooting a desktop workstation that powers on for two seconds—illuminating internal LEDs and spinning fans—before immediately shutting down without displaying video or emitting POST beep codes. Arrange the following diagnostic steps in the correct chronological order from the initial least-invasive check to the final advanced isolation step.
- 1Disconnect all non-essential external peripherals and internal components, including secondary storage drives and expansion cards.
- 2Inspect and reseat the 24-pin ATX main power connector and 8-pin EPS12V CPU power connector.
- 3Measure the power supply unit's voltage outputs using a dedicated PSU tester or multimeter.
- 4Remove the motherboard from the chassis and perform a bench test (breadboarding) on a non-conductive surface with minimal components.
Cevap
The diagnostic process begins by disconnecting non-essential peripherals and internal hardware to eliminate short circuits, followed by verifying main motherboard power connections (24-pin ATX and 8-pin EPS12V). Next, the power supply's output rails should be checked with a PSU tester, and finally, the motherboard is removed from the enclosure to conduct a bench test to check for chassis shorts.
CompTIA hardware troubleshooting principles dictate moving from the simplest, least invasive actions to complex hardware teardowns. First, non-essential internal and external hardware is disconnected to eliminate short circuits. Second, primary motherboard power cables are verified. Third, the power supply is independently tested. Finally, complete disassembly and bench testing are performed to isolate chassis-grounding shorts.
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Anahtar Kavram
Methodological Hardware Isolation and Power Troubleshooting