• CPU’s power good wire “wakes up” the CPU
• CPU reads first line of POST program
• Bootstrap loader runs
• Check if disk is in FDD drive
• Look for O.S. on boot sector of hard drive
• NTLDR (Windows 2000/XP) or IO.SYS is loaded into RAM
• Control is transferred from bootstrap loader to the O.S.
• Core O.S. files, drivers and services are loaded into RAM
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