Basic Ingoing-Outgoing System (IIRC) but what does it really mean?
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You have all your pieces (CPU, hard drives, RAM, graphics card, …) Connected to your motherboard.
The motherboard itself is just a piece connecting them all so they can talk to each other.
The BIOS is a little piece of software that runs directly on the motherboard itself, to check all the components and let’s them work properly together.
Basic functions a Bios/motherboard does is like the start button and reste button, and also you can set which hard drives should be checked for an operating system (like windows).
So you press the start button, then your motherboard gets the input to start, so the bios starts as well and is checking in your settings which hard drives are connected and redirects the start i put to them as well, now it’s up to the hard drive to start the operating system.
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