A system administrator reports that a critical rendering workstation emitted a burning odor, abruptly powered down, and now fails to complete POST with no video output upon power-on attempts. Place the following diagnostic and isolation steps in the correct chronological sequence to safely identify and resolve the root cause according to standard CompTIA hardware troubleshooting methodology.
- 1Disconnect the main AC power cord and perform a detailed visual inspection of the motherboard, power connectors, and capacitors for scorched traces, melted plastic, or bulging tops.
- 2Disconnect all internal power cables from system components and use a multimeter or dedicated power supply tester to verify , , rails and the PWR_OK signal.
- 3Remove the motherboard from the chassis and execute a minimal POST bench test using only a known-good power supply, CPU, CPU cooler, and one module of RAM.
- 4Reinstall components into the chassis, boot into an offline diagnostic environment, and execute extended CPU thermal and RAM memory stress testing.
Answer
The correct diagnostic sequence begins with disconnecting AC power and visually inspecting for physical/thermal damage, testing the power supply unit in isolation, performing an out-of-chassis minimal POST test to eliminate grounding shorts, and finally conducting hardware stress tests under load.
The proper troubleshooting process follows a systematic path from low-risk physical/visual inspection to electrical isolation, core platform minimal testing, and final load verification. Disconnecting AC power and visually checking for burnt components protects hardware and personnel. Testing PSU output ensures stable voltage delivery. Breadboarding removes chassis shorting factors, and final software stress testing ensures long-term operational stability under heavy compute loads.
Step-by-Step Solution
Key Concept
CompTIA Hardware Troubleshooting Sequence for Motherboard, Power, and CPU Component Isolation