Look for any bulging or leaking capacitors on the circuit board, which are a clear indicator of imminent failure. Gathering Tools and Safety Equipment To perform this test correctly, you need a reliable digital multimeter capable of measuring DC voltage.
How to Verify ATX Connector Probes for Accurate Voltage Readings
Repeat this process for the +5V (red wire) and +3. 3V rails support the motherboard and other integrated circuits.
Connecting the Multimeter to the Rails Once the supply is running, carefully insert the multimeter probes into the appropriate slots of the 24-pin ATX connector. When you test a computer power supply with a multimeter, the primary goal is to verify that these rails are within their acceptable tolerance ranges, typically plus or minus 5% of the nominal voltage.
How to Verify ATX Connector Probes for Accurate Voltage Readings
If the readings remain stable during this phase, the power supply is likely healthy. Similarly, +5V and +3.
More About How to test a computer power supply with multimeter
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