Booting Process

 

  Booting in computer System is the initialization or starting of system.Simply it refers to turning on of PC from Power on to windows Startup.In order to efficient booting up the Hardware system, BIOS,and Operating system should be working properly.If this components are not working there is boot failure and the computer doesn't startup.
     When the computer's power is first turned on, the Central Processing Unit  initializes itself.Part of the CPU's initialization is to look to the system's  BIOS for its first instruction in the startup program. The ROM BIOS stores the first instruction, which is the instruction to run the computer.It determines  how the startup is initiated and in which sequence.Normally the Hard-disk has OS so the first boot sequence is to boot from Hard-disk. So we can see that while PC is initiated, it checks all the connected hardware and then It is directly followed by Microsoft windows Logo.
Similarly when there is boot failure due to Hard-disk damage We can use our PC by booting through Disk Drive or any other removable drive.For this we have to change BIOS Boot Priority setup to indicate which device to take into account at first.