What is Computer POST? Why is this important?
We post (POST) articles, comments, pictures, videos etc. on various websites or social media. This is not the post I am going to discuss today. Although the spelling is the same, the meaning and function are different. Before going into details about POST, let's take a look at some basic ideas about computer hardware.
Computer hardware
Everyone knows more or less about computer hardware. Still discussed. The parts of the computer that can be seen and touched are the hardware. For example: monitor, keyboard, mouse, casing etc. The motherboard is inside the casing again. From the name, you can understand that motherboard is an important hardware of computer. A lot of hardware is attached to the motherboard. Such as: power supply, processor, RAM, video card, hard disk etc. A personal computer is made with many more such hardware.
Now let's go to the main topic, what is POST on the computer? Why is this important?
POST
The full form of POST is Power On Self Test. Post is the first process performed by a software after the computer or other digital electronic device is turned on. Some continuous work instructions are given inside a ROM chip on the motherboard. This ROM chip is called BIOS. Post is a part of BIOS. After the motherboard is turned on, it is the job of the post to check whether all the necessary hardware such as video card, processor, RAM, hard disk, etc. are working properly. If everything is OK then give a beep sound once. And if there is an error, it constantly gives different beep sounds to indicate the error. The motherboard must have speakers for beep sounds. Modern motherboards have a small display to indicate errors that show error codes. This error code indicates a problem.
The post first examines the video card. If it is correct then the information posted can be seen on the monitor screen. Then constantly check the processor, RAM, hard disk. If all goes well then check if there is a keyboard and mouse. If everything is OK so far then it shows the way to go to BIOS settings. This is the work of the post so far. Then the BIOS does the next thing. Details about how the operating system loads and the BIOS after the computer is turned on will be written in the next post.
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