If the fan does not spin or makes grinding noises, the PSU is faulty. If the PSU fan spins continuously, the unit is receiving power and is likely functional.
Basic Steps to Test Your Computer Power Supply with a Multimeter
Hold the power button for a few seconds to drain residual power from the capacitors. This test bypasses the need for a case switch, allowing you to verify the unit is active.
Method 2: Using a Multimeter for Voltage Testing Pin (Red Wire) Pin Color Expected Voltage 1 Black 3. If the fan does not spin or makes grinding noises, the PSU is faulty.
Basic PSU Voltage Testing with a Multimeter
Straighten a paperclip and insert it into the green PS_ON pin (the second pin from the right) and any black ground pin adjacent to it. Follow these steps carefully: Unplug the PSU from the computer and locate the 24-pin main connector.
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