Link to post Share on other sites. Such units have several «pigtails» with SATA and Molex connectors for disks, several connectors to power the video card, 4-pin or 8-pin CPU power and 24-pin (maybe 20-pin motherboard power. Just short that to any ground (black) wire on the 20/24 pin main connector. There is one on either side of the green wire, use one of them, it doesnât matter which one as they will both work. But it's an industrial motherboard and doesn't seem to have a 24-pin power connector. How can you power on a power supply without a motherboard 20and 24 pin . The documentation isn't very clear. On the ATX 24 pin plug connector that connects into the motherboard, there is a green wire that triggers the PSU to power on. On the 20/24 pin plug, poke your piece of wire into the pin on the green wire and poke the other end of your wire into one of the pins with a black wire coming out of it. I want to use the supply to hook up several fans and create a cooling system. How to Turn on a Computer Power Supply Without a Computer: Computer powers supplies are readily available and make a good 12 volt or 5 volt power supply. Whilst a little unsafe, it can be done. It could also be that HP is using a custom board and you will need to get a PSU from them to work. How to get around having no signal. 3.Unplug all hardware devices cable from the power supply. Users can turn on a power supply without the motherboard by inserting a paperclip into the green and black wire sockets on the 20-24 pin connector. The CPU is much faster, so it would help with unrar, par2, transcode, etc. Open | Hardware So my computer is making a weird intermittent squealing noise and I have ruled out cpu fan, gpu fan and drives, which leaves the psu and the motherboard/cpu , I want to run just the psu to see if I ⦠For example, to test a power supply or to know the noise level of his cooler with his hands. After the above, grab the 24-pin connector and face its motherboard fasten clip towards your side. Therefore, unless your power supply connects to a working motherboard that sends that signal, the power supply will not work. It's really very simple. The only thing is when they are not connected to a computer you need a way to turn them on. Does anyone know if this would work with a standard ATX power supply using the +4 from the 20+4 pin connector? Many ATX and newer power supplies will not turn on without a sufficient load such as ⦠I just see a 4 pin connector. This is pin 16 (a green wire) on the main 20/24 pin connector. Can I turn my power supply on without motherboard? 4.Re-plug the AC power cord into the power supply. Look closely at your mainboard as not all board have the connector white I have seen a few that where black or grey. Also, as the PSU uses a switch-mode configuration to regulate line voltage down to ATX voltages you need to consider the loading on the power supply. Now all power supplies are standard ATX. (as show below) 2.Unplug the AC power cord from the power supply. 1.For your safety, please turn off the power supply first, then set the I/O switch on the back of power supply (if available) to "O" position. You should have a 20/24 pin and atleast one 4 pin power connector. If you connect the green wire with a black ground wire you can turn on the ATX power supply unit without a motherboard. Now find out the 24- pin power connector attached to the motherboard the system and remove it Also, for safety remove other connectors of the Power supply from the peripherals or components such as hard disk and Graphic card. This is an ATX Power Supply for a ⦠But it 's an industrial motherboard and does n't seem to have a 24-pin power connector it can be.. 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