How To Check Pc Power Supply

When you experience issues with your computer, the first step is to check the power supply. This is an essential component of your PC, and any problem with it can cause various issues. In this article, we will guide you on how to check PC power supply and ensure that it is working correctly.

What is a Power Supply?

Before we move onto the steps, let’s understand what a power supply is. A power supply is a device that converts AC (alternating current) into DC (direct current) and supplies it to the various components of your PC. It is responsible for providing power to your motherboard, CPU, and other peripherals.

Step 1: Turn Off the PC

The first step to check your PC’s power supply is to ensure that it is turned off. This is a safety precaution to protect you from electrical shock.

Step 2: Disconnect the Power Supply

Next, you need to disconnect the power supply from your PC. To do this, unplug the power cord from the back of your PC. You should also unplug any other cables that are connected to the power supply.

Step 3: Open the PC Case

Once you have disconnected the power supply, you need to open your PC case. This will give you access to the power supply and other components.

Step 4: Locate the Power Supply

You can easily locate the power supply by looking for a large box-shaped component inside your PC case. The power supply is usually placed at the top or bottom of the case.

Step 5: Check the Power Supply Fan

The power supply fan is responsible for keeping the power supply cool. Check if it is spinning or not. If it is not spinning, it means that the power supply is not receiving power.

Step 6: Check the Power Supply Connections

Check the power supply connections to make sure that they are secure. Any loose connections can cause power issues.

Step 7: Use a Multimeter

To check the power supply’s voltage, you can use a multimeter. Set the multimeter to DC voltage and connect the probes to the power supply’s 24-pin motherboard connector. The voltage should be between 11.4 and 12.6 volts.

Step 8: Check the Power Supply Capacitors

The power supply’s capacitors store electrical charge and help regulate the voltage. Check them for any signs of swelling or leakage. If you notice any issues, it means that the power supply is faulty.

Step 9: Use a Power Supply Tester

If you do not have a multimeter, you can use a power supply tester. It is a device that checks the power supply’s voltage and ensures that it is working correctly.

Step 10: Check the Power Supply Wattage

The power supply’s wattage indicates how much power it can supply to your PC. Check the power supply’s label to ensure that it is providing enough power for your PC’s components.

Step 11: Check the Power Supply Efficiency

The power supply’s efficiency indicates how much power it consumes and how much it supplies to your PC. An efficient power supply means that it uses less power and generates less heat.

Step 12: Check the Power Supply Noise Level

The power supply’s noise level is also an essential factor to consider. A noisy power supply can be distracting and annoying, especially if you work in a quiet environment.

Step 13: Check for Burning Smell

If you notice a burning smell coming from your PC, it means that there is an issue with the power supply. It could be due to overheating or a faulty component.

Step 14: Check the Power Supply Cables

Check the power supply cables for any signs of damage or fraying. Damaged cables can cause power issues and even pose a fire hazard.

Step 15: Replace the Power Supply

If you have checked all the above steps and still have power issues, it means that your power supply is faulty. You need to replace it with a new one.


Q: How often should I check my PC power supply?

A: It is recommended to check your PC power supply at least once a year to ensure that it is working correctly.

Q: Can a faulty power supply damage other components of my PC?

A: Yes, a faulty power supply can damage other components of your PC, including the motherboard, CPU, and hard drive.

Q: How can I prevent power supply issues?

A: To prevent power supply issues, make sure that you use a high-quality power supply, keep your PC clean and dust-free, and avoid overloading your power supply.


Checking your PC power supply is essential to ensure that your PC is functioning correctly. By following the above steps, you can easily check your power supply and identify any issues. Regularly checking your power supply can also help prevent any potential issues and ensure that your PC is running smoothly.