A computer power supply unit convents mains AC voltages to DC voltages to provide power to internal hardware found inside a computer. A computer power supply unit looks like a square metal box and is usually found mounted at the top, inside a computer case. Computer power supply units come in different watts, the more watts they are rated at, the more amps it can provide to internal components found inside your PC. This also means more consumption in electricity. A computer power supply unit also provides multiple 12 V, 3.3 V and 5 V rails, to provide different voltages for different types of hardware. A computer power supply constantly works hard to provide your PC with power, which creates lots of internal heat to build up inside. This is why you will find an exhaust cooling fan located at the back, which allows the PSU to get rid of the heat inside because the fan blows the hot air out. This makes it run at a cooler operating temperature and increase its lifespan.
If you have a PC ATX power supply and you don't have a actually computer with a working motherboard, you can still start it to see if its powers on. On the ATX 24 pin plug connector that connects into the motherboard, there is a green wire that triggers the PSU to power on. If you connect the green wire with a black ground wire you can turn on the ATX power supply unit without a motherboard. This is because the computer power supply unit thinks that you are pressing the power button on the front panel of your PC.
1) Your PSU will have a bunch of different color wires that all have a different role. The wire that you will need to locate is the 'Green' color wire. There is only one wire that is that color so it should be fairly easy for you to find. Trace this wire down right to the ATX 24 pin connector.
2) Once you have found the green wire on the ATX 24 pin connector, above the green wire's pin, there should be a black wire. This black wire is a ground wire and you will need it to jump start your PSU.
3) Next get your paper clip and bend it into a U shape so it has two ends. Insert one end of the paper clip into the green wire's pin on the ATX 24 pin connector. Then insert the other end of the paper clip into the black wire's pin on the ATX 24 pin connector. This will bridge a connection between both wires without the need to cut the wires from the connector and join them together.
4) Insert the power cord into your PC power supply unit, insert the plug into a wall socket and turn it on. Next flick the power switch found on the back of the PSU into the 'On' position and it will attempt to power itself on. If it's successfully turned on, the cooling fan will spin and you will able to hear it. If the PSU fails to power on in this test, it is faulty and needs to be replaced with a new one.
How To a Test Computer Power Supply Using a Paper Clip
1) Your PSU will have a bunch of different color wires that all have a different role. The wire that you will need to locate is the 'Green' color wire. There is only one wire that is that color so it should be fairly easy for you to find. Trace this wire down right to the ATX 24 pin connector.
2) Once you have found the green wire on the ATX 24 pin connector, above the green wire's pin, there should be a black wire. This black wire is a ground wire and you will need it to jump start your PSU.
3) Next get your paper clip and bend it into a U shape so it has two ends. Insert one end of the paper clip into the green wire's pin on the ATX 24 pin connector. Then insert the other end of the paper clip into the black wire's pin on the ATX 24 pin connector. This will bridge a connection between both wires without the need to cut the wires from the connector and join them together.
4) Insert the power cord into your PC power supply unit, insert the plug into a wall socket and turn it on. Next flick the power switch found on the back of the PSU into the 'On' position and it will attempt to power itself on. If it's successfully turned on, the cooling fan will spin and you will able to hear it. If the PSU fails to power on in this test, it is faulty and needs to be replaced with a new one.
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