Set the multimeter to the DC voltage range, insert the black probe into a black ground pin and the red probe into a colored pin on the 24-pin connector. Set the multimeter to the DC voltage range, insert the black probe into a black ground pin and the red probe into a colored pin on the 24-pin connector.
Accurately Measuring DC Voltage Output with a Multimeter
Ensure that the power cable is securely seated in both the wall outlet and the PSU, and verify that the correct voltage switch on the back of the unit matches your regional power standard. Bent or broken retention pins can prevent proper contact, causing the system to behave as if power is absent.
Use a PSU tester that applies a load across each rail and displays voltage stability. 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.
Accurately Measuring DC Voltage with a Multimeter to Confirm PSU Stability
Voltage spikes or drops under no load, or larger deviations when a load is applied, indicate a failing regulator stage. Examine the primary electrolytic capacitors near the heat sink for bulging tops, leakage, or crusty residue.
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