A technician is troubleshooting a desktop workstation that experiences a No POST condition where internal fans spin continuously but no diagnostic beep codes or display output occur. Place the technician's troubleshooting steps in the correct order from first action to last action to systematically isolate the root cause.
- 1Verify power supply unit (PSU) voltage outputs using a multimeter or dedicated power supply tester.
- 2Disconnect non-essential peripherals, storage drives, and expansion cards to create a minimal boot configuration.
- 3Reset the motherboard CMOS/NVRAM settings using the jumper pin or coin-cell battery removal.
- 4Remove the motherboard from the chassis and perform a bench test on a non-conductive anti-static mat.
Cevap
The correct systematic ordering of troubleshooting steps is: 1) Verify power supply unit (PSU) voltage outputs using a multimeter or dedicated tester; 2) Disconnect non-essential peripherals, storage drives, and expansion cards to create a minimal boot configuration; 3) Reset the motherboard CMOS/NVRAM settings using the jumper pin or coin-cell battery removal; 4) Remove the motherboard from the chassis and perform a bench test on a non-conductive anti-static mat.
Systematic hardware diagnostics move logically from non-invasive, quick checks to complex disassembly. First, power supply stability must be verified using a hardware tester to ensure all main motherboard rails receive proper power. Second, establishing a minimal boot configuration (motherboard, CPU, one RAM stick, PSU) isolates faulty add-in cards or storage drives. Third, clearing CMOS clears invalid hardware settings that prevent POST. Finally, removing the motherboard for a bench test checks for grounding shorts against the computer case.
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CompTIA Hardware Isolation and Troubleshooting Methodology