How to build a PC from scratch: A beginner’s guide


Building a PC for the first time can feel intimidating, but with careful planning and a step-by-step approach, you can build your own computer without hassle. This guide will walk you through each step of the process, from gathering the necessary components to installing each part and getting your PC up and running.


What You Need to Build a PC

Core Components:

  • Case: Houses all your components.
  • CPU (Processor): The brain of your computer.
  • CPU Cooler: Keeps the CPU from overheating.
  • Motherboard: The main circuit board that connects all components.
  • RAM (Memory): Short-term memory for your computer.
  • Storage (SSD/HDD): Long-term storage for your files and programs.
  • Power Supply (PSU): Provides power to all components.
  • Graphics Card (GPU): Renders images to your monitor (optional if using integrated graphics).

Tools and Supplies:

  • Philips head screwdriver
  • Anti-static wrist strap (optional but recommended)
  • Clean, flat work surface


Safety First

Static electricity can damage components. To minimize this risk:

  • Wear an anti-static wrist strap.
  • Work on a hard, flat surface, not on carpet.
  • Keep components in their anti-static bags until you’re ready to install them.
  • Touch the case frequently to ground yourself.


Step-by-Step Guide

1. Opening the Case

  1. Lay Down the Case: Place the case on your work surface and remove the side panels, typically by unscrewing the thumbscrews or screws on the back.

2. Installing the Power Supply

  1. Locate PSU Mounting Point: Usually at the bottom rear of the case.
  2. Install PSU: Slide the PSU into place with the fan facing down (check your case’s manual). Secure it with the screws provided.

3. Installing the Processor

  1. Prepare the Motherboard: Place it on a flat surface.
  2. Install CPU: Open the CPU socket on the motherboard, align the CPU according to the notches or triangle markers, and gently place it in the socket. Lock it in place by lowering the retention arm.

4. Installing RAM

  1. Open RAM Slots: Push the plastic clips at the ends of the RAM slots outward.
  2. Install RAM: Align the notch on the RAM stick with the notch in the slot. Firmly press down until the RAM clicks into place and the clips snap back.

5. Installing the Motherboard

  1. Install I/O Shield: Snap the I/O shield (if separate) into the back of the case.
  2. Mount Standoffs: Screw standoffs into the case to align with the motherboard’s mounting holes.
  3. Install Motherboard: Place the motherboard in the case, aligning it with the I/O shield and standoffs. Secure it with screws.

6. Installing the CPU Cooler

  1. Apply Thermal Paste: If not pre-applied, apply a pea-sized amount of thermal paste to the center of the CPU.
  2. Attach Cooler: Follow the cooler’s instructions to secure it to the motherboard. Connect the cooler’s power cable to the appropriate header on the motherboard.

7. Installing the Graphics Card

  1. Remove Backplates: Remove the necessary backplates from the case to accommodate the GPU.
  2. Install GPU: Insert the GPU into the top PCIe x16 slot on the motherboard. Secure it with screws and connect any necessary power cables from the PSU.

8. Installing Storage Drives

  1. Mount Drives: Install SSDs or HDDs into their respective bays or mounting points in the case.
  2. Connect Cables: Attach SATA data cables to the drives and motherboard, and connect SATA power cables from the PSU.

9. Connecting Cables

  1. Main Power Cable: Connect the 24-pin main power cable from the PSU to the motherboard.
  2. CPU Power Cable: Connect the 4/8-pin CPU power cable to the motherboard.
  3. Front Panel Connectors: Connect the case’s front panel connectors (power button, USB ports, audio, etc.) to the appropriate headers on the motherboard.
  4. Other Cables: Connect any additional power cables for fans, RGB lighting, or other peripherals.


Final Steps

  1. Power On: Switch on the PSU and press the power button on the case. If everything is connected properly, the system should boot.
  2. Install Operating System: Insert your OS installation media (USB or DVD) and follow the on-screen instructions to install the OS.
  3. Install Drivers: Once the OS is installed, install the necessary drivers for your motherboard, GPU, and other components.
  4. Configure BIOS/UEFI: Access the BIOS/UEFI during boot and configure settings such as boot order, XMP for RAM, and other system preferences.



If the system doesn’t boot, double-check all connections, ensure components are seated properly, and refer to your motherboard’s manual for troubleshooting error codes or beeps.

With a bit of patience and careful attention to detail, you can successfully build your own PC. Enjoy the satisfaction of creating a machine tailored to your needs, and don’t hesitate to refer to online resources or forums if you encounter any issues. Happy building!