What happens when your PC on?
When your computer is first turned on, it automatically loads a program called the BIOS, or Basic Input/Output System, which is stored on a special chip on your computer’s motherboard.What is BIOS actually?
BIOS is essentially a combination of software and hardware in that it consists of software, but the contents of that software is stored in a hardware chip. On most recent computers, the BIOS can be updated via a process called flash updating, which uses a piece of software that’s stored on a special start up floppy disk to overwrite the contents of the chip with a new version.
As the BIOS runs, it performs a number of tests on your hardware called POST (Power On Self Test), such as checking the memory. Then it lists any devices that it finds attached to your computer’s internal IDE controller(s). Typically, this is any internal hard drives, CD/DVD-ROM drives, tape drives, etc.
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