Here are some of the most commonly used methods of testing power supplies. If you have a multimeter, you can use it for this purpose. Connect a tester lead (red and black) to the AC outlet and then connect the other end of the tester lead to the ground of the power supply. Now check whether the tester lead is making a circuit.
You could try using a multimeter to check the +/-5V and +/-12V rails. Due to the switching nature of the power supply, you'll want to put a resistor in series with your probes while measuring. Getting/learning how to use a multimeter with electronic products is a good thing to do, and part of becoming superuser-awesome.
Remember: While a Power Supply Tester provides a quick and easy way to test your PSU, it might not simulate the full load your computer demands. It’s an excellent first step in troubleshooting but may not catch every issue. As we’ve seen, using a Power Supply Tester is a straightforward and effective method to check the health of your power supply.
Sometimes, however, you might need to test your power supply unit (PSU) to ensure that it's in good working order. Testing your power supply can be a key part of troubleshooting certain PC issues, or it might be a precautionary measure when you're installing a power supply in a new PC.
While the jumper bridge test will only tell you if the power supply unit turns on, you can use a multimeter to test the connectivity and voltage between all the different pins. To do so, you simply need to short out the Power On pin and an adjacent ground pin with a jumper, as we did in the previous section.
Most well-stocked geek-stores sell a "power-supply tester" that has all the appropiate connectors to plug each part of your PSU into, with spiffy LEDs indicating status of the various rails, connectors for IDE/SATA/floppy power cables, etc. They run ~$20 US. Search
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Power supplies have a short-circuit cutout which resets after being disconnected for 30 seconds or so. Disconnect the mains supply to the computer completely and wait for at least 30 seconds. Reconnect it and try again.
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