---
title: "Discussion on \"What Happens When You Turn On Your Computer? How an Operating System Boots Up\" | Hashnode"
description: "Discussion on \"What Happens When You Turn On Your Computer? How an Operating System Boots Up\". A step-by-step walk from the power button to the login screen: firmware, POST, BIOS vs UEFI, GRUB, the Linux kernel, initramfs and systemd."
url: "https://hashnode.com/posts/what-happens-when-you-turn-on-your-computer-how-an-operating-system-boots-up/6ae624ff9921c888136b15b8"
---

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# [What Happens When You Turn On Your Computer? How an Operating System Boots Up](https://mayankdev.hashnode.dev/what-happens-when-you-turn-on-your-computer-how-an-operating-system-boots-up?utm_source=hashnode&utm_medium=feed)

A step-by-step walk from the power button to the login screen: firmware, POST, BIOS vs UEFI, GRUB, the Linux kernel, initramfs and systemd.

Oct 31 · 18 min read · mayankdev.hashnode.dev  
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-   [#operating-system](https://hashnode.com/tag/operating-system)
-   [#linux](https://hashnode.com/tag/linux)
-   [#computer-science](https://hashnode.com/tag/computer-science)
-   [#beginners](https://hashnode.com/tag/beginners)
-   [#systemd](https://hashnode.com/tag/systemd)

## Written by

[Mayank Mahajan](https://hashnode.com/@Mayank9056)

@Mayank9056 · Maharashtra, India

  
[View profile](https://hashnode.com/@Mayank9056)

Backend-Focused Full Stack Developer

Backend-focused Full Stack Developer building production-grade web applications. I write about backend engineering, system design, authentication, databases, DSA, and lessons learned while building real-world software.

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