TAILIEUCHUNG - What Happens When You Start Your Computer

What Happens When You Start Your Computer As stated earlier in this chapter, the Windows XP/Windows Server 2003 boot sequence closely resembles that of Windows NT/2000 | What Happens When You Start Your Computer As stated earlier in this chapter the Windows XP Windows Server 2003 boot sequence closely resembles that of Windows NT 2000. Listed below are the processes that take place when Windows NT-based operating system successfully starts on an v86-based computer Power On Self Test POST Initial startup process Boot loader process Operating-system selection if you have a multi-boot system Hardware detection Hardware-profile selection Kernel-loading process Kernel-initialization process User-logon process Note The startup sequence quoted above applies to systems started or restarted after a normal shutdown. The startup processes begin when you do one of the following Turn on the computer Reboot the system However this startup sequence does not apply when resuming from hibernate or standby modes. When you log on the process of loading Windows NT 2000 Windows XP or Windows Server 2003 is completed as well as are most of the initialization procedures. However the startup can only really be considered as successfully completed after you log on to the system. The following requirements need to be met to successfully begin the Windows NT 2000 XP Windows Server 2003 startup Correct initialization of all the hardware. Presence of all required files for starting the OS. If any of these files aren t present in the correct folder or are corrupt the startup will fail. Power on Self Test When you turn on or restart your computer it undergoes the Power On Self Test POST procedure. The POST routine is a set of tests performed by the CPU which as soon as power is switched on starts to perform the code contained in the motherboard system firmware. Firmware known as the basic input output system BIOS on 86-based systems and internal adapters contains the code necessary to start the computer. The POST routine performs the following two tasks Runs the POST diagnostic routine which depending on the firmware might run some rudimentary hardware checks .

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