The three main stages of the boot process are the power-on, power-on self test
(POST), and operating system (OS) loading steps.
Power-on/CPU Wakes
You start the process by powering the systemon, sending current to the motherboard
and drives. Assuming your power supply is in good working order, a special
wire on the CPU called the power good wire is charged, telling it to wake up.
The CPU then communicates with the system ROM chip and starts the BIOS
programs.
POST
Unlike a person who wakes up knowing who they are and how many fingers
they have, a computer literally rediscovers itself every time it powers up. This is
done via the POST process.During POST, the systemBIOS communicates with