How Does Your Computer Actually Turn On? (Boot Process Explained)

Ever wondered what actually happens in those few seconds between pressing the power button and seeing your desktop? It's not magic — it's a carefully orchestrated sequence of hardware and software working together. In this video, we break down the entire boot process from scratch: What the PSU does when you press power How the CPU wakes up and where it starts executing What BIOS is and how it finds your operating system The 512-byte boot sector — and the magic bytes that make it work This is Episode 1 of the series "Let's Make custom Bootloader" — where we go from zero to writing a real x86 bootloader in assembly that transitions the CPU all the way to 64-bit Long Mode. ━━━━━━━━━━━━━━━━━━━━━━━ GitHub Repo: https://github.com/nrjlamsal/Bootload... #bootloader #assembly #operatingsystem #lowlevel #programming #x86 #bios #computerscience