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In this lesson,
we're going to learn
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how our operating
system starts up.
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As an IT support specialist,
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you'll probably work on lots
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of computers that won't start.
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It's important to know the steps
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and operating system takes,
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so you can help
diagnose the issue.
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Booting a computer or starting
a computer comes from
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the phrase to pull oneself
up by one's bootstraps.
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Basically, it means to start
from nothing and follow
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a series of steps to
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arrive at a fully
operational system.
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When we start up with computer,
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will use the term boot.
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For most operating systems,
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the boot process follows
a general pattern,
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much like how we
have different cars
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startup in the same way.
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Put in the key, turn
on the ignition, etc.
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Here's a rundown of
the boot process.
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First, the computer
is powered on.
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The BIOS/UEFI is a
low-level software that
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initializes our
computer's hardware
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to make sure everything
is good to go.
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Next, the bios UEFI runs
a process called the
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power-on self-test, or post.
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The post performs a series
of diagnostic tests to
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make sure that the computer
is in proper working order.
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Next, depending on the bios or
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UEFI configuration of boot
device will be selected.
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Devices that are attached to
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our system, like hard drives,
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USB drives, CD drives,
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etc, are configured in
a certain boot order.
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The devices will be
checked in this order and
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the computer will search for
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what's known as a bootloader.
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The bootloader is
a small program
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that loads the operating system.
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Once our computer finds
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a bootloader on a device
in the listed order,
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it will start to
execute this program.
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This will then start to load
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a larger and more
complex program
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and eventually loads
our operating system.
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Once the bootloader loads
up our operating system,
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our kernel gets loaded.
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The kernel controls access
to our computer's resources.
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It also loads up
drivers and more so
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that our hardware can
talk to our software.
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Next, essential system
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processes and user space
items are launched.
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These include processes
like user login,
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spinning up a
desktop environment,
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and more which basically
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allows us to interact
with our system.
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And that's it. After
these simple steps,
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you'll be able to get to work.
4435
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