3V 2 Black 5V 3 Orange 3. If the fan does not spin or makes grinding noises, the PSU is faulty.
Visual and Physical Inspection Tips for a PSU
3V 4 Yellow 12V 5 Yellow 12V 6 Red 5V 7 White -12V 8 Gray P. Method 1: The Paperclip Test (Basic Power-On Test) The paperclip test is a standard method to check if the PSU turns on and outputs power to the rails.
Look closely at the vents and fan; dust buildup here can lead to overheating and failure. Follow these steps carefully: Unplug the PSU from the computer and locate the 24-pin main connector.
PSU Visual Physical Inspection Tips
Check the cables for fraying or bent pins, particularly the 24-pin ATX and CPU connectors. This test bypasses the need for a case switch, allowing you to verify the unit is active.
More About How to test power supply of computer
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