What happens if you turn on the computer?

Dave Ng
Jul 28, 2023

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  1. The power supply sends electricity to the components of the computer, such as the motherboard, hard drive, and fans.
  1. The BIOS (basic input/output system) initializes and performs a power-on self-test (POST), which checks the essential hardware components to ensure they work correctly. If any issues are detected, error messages may be displayed.
  2. The operating system (OS), such as Windows or macOS, is loaded from the hard drive or another storage device into the computer’s RAM (random access memory).
  3. The OS then initializes its own components and drivers and presents the login screen or desktop environment to the user.

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