How do a computer main board start up?
When you press the start button on a computer what procedures happen to turn on the CPU.
In another way, a CPU has a DC-DC converter to supply own variable power needs. But what things I want to know are a systematic procedure of turning on a CPU.
Thank you in advance for whom giving me guidance.
Mohamad, I would not say the mainboard starts up but the whole computer instead, because that process includes not only the mainboard but also the power supply, the BIOS, the CPU, the I/O system, etc.
When you press the "start button", the first thing that is activated is the Switched-mode power supply (SMPS), that converts the typical/domestic 110/220/240V AC (depending on where you are) to 12V DC, then this device activate the flow of 12V DC to the mainboard, and when the Central Processing Unit (CPU, which is of course connected to the mainboard) detects this voltage (12V DC) it automatically executes the program encoded in a memory called Basic Input Output System (BIOS), which performs a number of tasks, such as the Power On Self Tests (or POST, for checking memories, I/O system, etc), and then looks for the Master Boot Record (MBR) on a preset I/O device, for booting the operating system that this piece of code within the MBR is pointing to.
Broadly speaking, that is the process. I suggest you to look for more information searching for "booting process" and/or any of the acronyms that I have used here.
I hope that helps. Best regards.
Thank you, dear Ramirez-Flandes, for your response to my question. I've learned so much information from your comment. This is exactly what i seek for it.
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