Diagnosing a faulty power supply requires a systematic approach that combines visual inspection, electrical testing, and load validation to isolate the root cause. Unplug the PC, short the green PS_ON pin to any black ground pin on the 24-pin motherboard connector using a paperclip, and plug the unit into a wall outlet.
How to Identify Power Supply Voltage Rail Issues
Select a unit with higher wattage than your system requires, ensuring quality certifications such as 80 Plus Bronze or Gold for efficiency and stability. 3V, +5V, and +12V rails; each should read within ten percent of their labeled values.
Bent or broken retention pins can prevent proper contact, causing the system to behave as if power is absent. Reseat the 24-pin connector firmly into the motherboard, ensuring the clip locks into place.
How to Test 3V, 5V, and 12V Rails with a Multimeter
3V, +5V, and +12V rails; each should read within ten percent of their labeled values. If the readings fluctuate wildly under load, the internal transformer or regulation circuitry is likely degraded.
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