PC Hardware

How do I set up a power supply?

Updated 2026-08-14

Quick answer

To set up a power supply, connect the 24-pin ATX connector to the motherboard, then attach the necessary power cables to your components such as the CPU, GPU, and storage devices.

This guide provides the steps to properly set up a power supply unit (PSU) in a PC, including connections to the motherboard and components.

Steps

  1. 1

    Prepare the Case

    Ensure the PC case is open and the PSU is securely mounted, usually at the bottom or top of the case.

  2. 2

    Connect the 24-Pin ATX Cable

    Locate the 24-pin ATX cable and connect it to the motherboard's power socket.

  3. 3

    Connect CPU and GPU Power Cables

    Connect the 4/8-pin CPU power cable to the motherboard and the PCIe power cables to the GPU if applicable.

  4. 4

    Connect Storage Devices

    Use SATA power cables to connect to your SSDs and HDDs.

Overview

A power supply unit (PSU) converts electrical power from an outlet into usable power for your computer components. Proper setup is essential for system stability.

Connections

Ensure you have the right cables for your components. The main connections include the 24-pin ATX for the motherboard, 4/8-pin CPU power, and PCIe for the GPU.

Testing the Setup

After connecting all cables, power on the system to ensure all components receive power. Listen for any unusual sounds and check for LED indicators.

Watch out for

  • Ensure the power supply wattage is sufficient for all connected components.
  • Check compatibility of connectors with your motherboard and components.

FAQ

What should I do if the power supply doesn't turn on?

Check all connections to ensure they are secure and verify that the PSU switch is in the 'on' position.

Can I use an old power supply with new components?

Ensure the old power supply meets the power requirements of your new components, especially the wattage and connector types.

Is it safe to use a power supply without a surge protector?

While not mandatory, using a surge protector is recommended to protect your components from electrical surges.