The 24-pin main power connector has +3.3 VDC, +5 VDC, -5 VDC (optional), +12 VDC, and -12 VDC lines across multiple pins. To make testing your power supply easier, you should also move your disconnected and open computer case somewhere easy to work like on a table or other flat, non-static surface. Connect the GREEN wire with the adjacent BLACK wire. If yes, replace the power supply. Ever since my first Sincair ZX81, I've been into computers and now retro computers consoles and other technology, immersing myself in this awesome hobby. You'll need to continue testing to confirm that. This will confirm that each line is supplying the proper voltage and that each pin is properly terminated. This will make it as easy as possible to test the power supply connections. Then, touch the tip of the red probe to the opposite terminal or end of the circuit. It is always good practice to test a power supply before using it for the first time. There is no need to remove the actual power supply unit from the computer nor is there any reason to disconnect any data cables or other cables not originating from the power supply. Make sure that all pins are terminated as required. Power Supply Multimeter. Manually testing a power supply involves working closely with high voltage electricity.Don’t skip this step! How to Test a Power Supply Using a Multimeter. There are generally two ways to test a power supply: with a multimeter or through a device known as an automatic power supply tester. This video will show you my current progress and the comments will identify the net result In short, this involves turning off the computer, removing the power cable, and unplugging anything else connected to the outside of your computer.To make testing your power supply easier, you should also move your disconnected and open computer case somewhere easy to work like on a table or other flat, non-static surface. Aside from the main power connector to the motherboard, don't forget to provide power to your hard drive(s), an optical drive(s), and floppy drive. 2. Safety should be your primary concern during a power supply test and there are several points you should be aware of before starting this process. link to What are the Amiga 1200 Motherboard Dimensions ? Step 2 Get the multimeter and test the electrical socket to get a proper reading of its output. A properly executed PSU test using a multimeter should confirm that the power supply is in good working order or if it should be replaced. If you have a negative polarity power supply, then you will get a negative reading. Turn on your multimeter and turn the dial to the VDC (Volts DC) setting.If the multimeter you’re using doesn’t have an auto-ranging feature, set the range to 10.00V. Aside from the main power connector to the motherboard, don’t forget to provide power to your hard drive(s), an optical drive(s), and floppy drive. The voltage should be clean and steady, not dropping when you put a moderate load on it. You'll need to reference the ATX 24-pin 12V Power Supply Pinout for the locations of these pins. Power supply multimeter test guide. Plug in your power supply, flip the switch on the back if you have one, and then turn on your computer as you normally do with the power switch on the front of the PC.Yes, you’ll be running your computer with the case cover removed, which is perfectly safe as long as you’re careful.It’s not common, but if your PC doesn’t turn on with the cover removed, you may have to move the appropriate jumper on the motherboard to allow this. Next, attach the leads of your DMM to the input lines. If all voltages are within tolerance, your power supply isn’t defective.If your power supply passes your tests, it’s highly recommended that you continue testing to confirm that it can operate properly under a load. 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