ATX power supply pinout charts are useful references when testing a power supply. You will need to know which pins correspond to ground or specific voltages before you can successfully test a PSU.
ATX Bench Power Supply – Convert a Computer Power Supply
Each pinout table linked below (in the headings of each section) conforms to version 2.2 of the ATX specification (PDF).
The ATX 24 pin main power connector is the standard motherboard power connector used in almost every computer. The connector itself is a Molex 39-01-2240 connector (also known as Molex Mini-fit Jr).
This is the large 24-pin connector that usually attaches to the edge of the motherboard.
