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Testing Your PC Power Supply: A Guide

by Marcin Wieclaw
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how to test pc power supply

Testing your computer’s power supply (PSU) is a crucial step in troubleshooting computer issues. A failing PSU can lead to computer crashes, random shutdowns, and even hardware failures. To avoid such problems, it is essential to test the PSU’s functionality before installing it in your computer.

There are various methods to test a PC power supply, each with its own advantages and ease of use. The three most common methods are:

  • Basic Jumper Test
  • Multimeter Test
  • PSU Tester

The basic jumper test involves using a jumper wire to bridge the power supply’s green and black pins. This test allows you to determine if the PSU can power on without being connected to the computer’s components.

The multimeter test requires the use of a multimeter to measure the voltage outputs of the power supply. This method provides a more detailed analysis of the PSU’s performance and can help identify any irregularities.

A dedicated PSU tester is another option that simplifies the testing process. These testers come with built-in displays and connectors to assess the power supply’s voltage outputs and overall performance quickly.

Regardless of the testing method chosen, it is essential to ensure the functionality of your PSU before connecting it to other hardware components. This precautionary step helps prevent potential damage and ensures a smooth computing experience.

Signs Your PSU Is Failing

A failing power supply unit (PSU) can lead to a range of issues in your computer system. It’s crucial to be aware of the signs that indicate a failing PSU so that you can address the problem promptly. Here are some common indicators of a bad PSU:

  1. Random system crashes or freezes: If your computer suddenly shuts down or freezes without any apparent reason, it could be a sign of a faulty power supply.
  2. Inconsistent power delivery: A failing PSU may cause fluctuations in power output, leading to inconsistent performance of your computer. You may experience sudden shutdowns or unexpected reboots.
  3. Unusual noises: Buzzing, whining, or grinding sounds coming from the power supply could indicate internal issues and potential failure.
  4. Overheating components: Insufficient power supply can cause certain components, like the CPU or graphics card, to overheat. This can result in system instability and poor performance.
  5. Non-responsive peripherals: If your peripherals, such as USB devices or external hard drives, intermittently fail to work or lose connection, it could be due to inadequate power supply.
  6. Blue screen of death (BSOD): Frequent occurrence of BSOD errors or system crashes can be associated with a failing PSU.

If you notice any of these symptoms, it’s essential to investigate the cause and consider replacing your power supply unit to avoid potential hardware damage and data loss.

How to Test Your PSU

Testing your PC power supply unit (PSU) is essential to ensure its functionality and troubleshoot any potential issues. There are three commonly used methods to test a PSU:

1. Jumper Test: This method involves using a jumper wire to bypass the motherboard and connect the green wire (PS_ON) with any black wire (ground) on the 24-pin motherboard connector. If the PSU fan turns on, it indicates that the PSU is receiving power and functioning.

2. Multimeter Test: A multimeter can be used to measure the voltage outputs of the PSU connectors. Set the multimeter to DC voltage mode and carefully insert the multimeter probe into the appropriate connector. Compare the measured voltages with the specified values provided by the PSU manufacturer. Any significant deviation could indicate a faulty PSU.

3. PSU Tester: PSU testers are portable devices designed specifically for testing power supplies. They provide a quick and convenient way to assess the PSU’s performance by checking the voltage outputs, fan speed, and other parameters. Simply connect the PSU to the tester and follow the instructions provided to obtain the test results.

Remember to follow safety precautions while testing the PSU and ensure your computer is powered off and unplugged. Testing the PSU can help identify potential issues and avoid inconvenient system shutdowns or damage to other components.


Why is testing your computer’s power supply unit (PSU) important?

Testing your computer’s power supply unit is important because a failing PSU can cause various problems such as computer crashes, random shutdowns, and hardware failures. It helps in troubleshooting computer issues and ensures the functionality of the PSU before installing it in a computer.

What are the signs of a failing power supply unit?

Some signs of a failing power supply unit include computer crashes, random shutdowns, hardware failures, strange noises coming from the PSU, overheating, and poor performance.

How can I test my power supply unit?

There are several methods to test a power supply unit. You can perform a basic jumper test by connecting the green wire and any black wire on the motherboard connector. Alternatively, you can use a multimeter to measure the voltage output of the PSU. Another option is to use a PSU tester, which is a dedicated tool for testing power supplies.

Can I test a power supply unit without installing it in a computer?

Yes, you can test a power supply unit without installing it in a computer. The basic jumper test and using a multimeter or PSU tester methods can be carried out without connecting the PSU to the rest of the system.

What should I do if my power supply unit fails the test?

If your power supply unit fails the test, it is recommended to replace it with a new one. A faulty PSU can cause damage to other hardware components and lead to further issues with your computer.


  • Marcin Wieclaw

    Marcin Wieclaw, the founder and administrator of PC Site since 2019, is a dedicated technology writer and enthusiast. With a passion for the latest developments in the tech world, Marcin has crafted PC Site into a trusted resource for technology insights. His expertise and commitment to demystifying complex technology topics have made the website a favored destination for both tech aficionados and professionals seeking to stay informed.

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