First startup of a PC: the complete guide (2026)


You’ve just built your PC or received a new one.

Everything is connected, the power button is there… but before you charge ahead, you need to follow a few key steps to avoid common mistakes and ensure a clean, proper boot.

This guide gets straight to the point:

no pointless waffle, no risky shortcuts—only what you need to know for a fully controlled first startup.

Before turning on your PC: the essential checks


Before even pressing the power button, take a minute to check these points.

90% of first-startup problems come from here.

  • The monitor is plugged into the graphics card (not the motherboard)
  • The PC power cable is firmly seated
  • The power switch is set to ON (|)
  • The keyboard and mouse are connected
  • The monitor is on and set to the correct input source (HDMI / DisplayPort)


👉 If you don’t get a display the first time you power on, start with these checks.

First power-on: what’s normal (and shouldn’t worry you)


A PC’s very first startup is never instant.

The system runs several internal initialisation steps, including memory and hardware.

You may notice:

  • A longer-than-usual boot
  • One or two automatic restarts
  • Fans ramping up
  • A black screen for several seconds


👉 As long as the PC doesn’t shut down abruptly, don’t touch anything.

Let it do its work.

No display on the screen: how to react intelligently


If the screen stays black after several tens of seconds:

  1. Check that the video cable is plugged into the graphics card
  2. Manually change the monitor’s input source
  3. Test another cable if possible
  4. Wait another minute during the very first boot


A display that takes a while to appear is common, especially with newer RAM or an up-to-date BIOS.

BIOS / UEFI access: when and why to use it


On the first startup, you can enter the BIOS (press DEL or F2, depending on the motherboard).

It’s not mandatory, but it’s strongly recommended if you want to do things properly.

Only check:

  • The processor is correctly recognised
  • The RAM capacity is correct
  • The main SSD is detected
  • The CPU temperature is normal (at idle)


👉 If everything is detected correctly, don’t change anything for now.

Windows installation: the proper method


Two scenarios:


Windows isn’t installed

  • Create an official USB key using Microsoft’s tool
  • Start the PC with the USB key plugged in
  • Choose your main SSD during installation
  • Let Windows manage partitions automatically


Windows is already installed

  • Just follow the setup assistant
  • Sign in to your Microsoft account (or local)
  • Finish network and language setup


👉 Avoid modified versions of Windows or dubious tools on the first startup.

After installation: the essential settings


Once you’re on the desktop, don’t launch all your games straight away.

Start with these key steps:

  • Run all Windows updates
  • Install the GPU drivers (official NVIDIA / AMD)
  • Check your monitor refresh rate (144 Hz, 165 Hz, etc.)
  • Install chipset drivers if needed


👉 These steps ensure stability, performance, and compatibility.

Memory optimisation (XMP / EXPO): when to enable it


By default, your RAM doesn’t run at its maximum frequency.

Activating the XMP profile (Intel) or EXPO (AMD) is done in the BIOS.

Tips:

  • Enable it only after a first stable startup
  • Check that the configuration is supported
  • Back up and test stability

If the PC restarts correctly, the optimisation is validated.

What you definitely shouldn’t do on the first startup


Avoid these common mistakes:

  • Unplugging components while the system is running
  • Changing BIOS settings “at random”
  • Forcing shutdown several times
  • Installing 15 programs at the same time
  • Overclocking on day one


A stable PC is one you upgrade progressively.

If something doesn’t work


If you run into an issue:

  • Go back to the basics (cables, display, power)
  • Note down exactly what happens
  • Don’t take anything apart in a rush


A problem on the first startup almost always has a simple cause.

Getting it right from the start means ensuring your PC lasts longer


The first startup isn’t just a simple press of a button.

It’s the foundation of a stable, high-performance, long-lasting PC.

Take your time, follow the steps, and you’ll end up with a healthy setup.

Once everything’s in place, you can finally enjoy your PC with total confidence.


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