Computer Boot Process animation

[DeerJerky]

I love how this person started posting drawing tutorials, decided to drop a quick, accurate, and easy-to-understand video on how POST functions, and then returned to posting drawing tutorials as if nothing happened

[mark]

Boot Process (from this video):

1. Power supply sends power to the motherboard, which activates the boot process.
2. POST (Power On Self Test) instructions are stored in a ROM (Read Only Memory) chip, as part of the BIOS (Basic Input Output System).
3. The POST runs through series of tests to ensure that everything is working.
4. Most POST sequences will have a combination of audible and visual messages to let you know what is or isn’t working. These are the beeps you generally hear when the computer is booting up.
5. The POST checks your video card. At that point you will see information of the POST on the screen.
6. The POST send checks to make sure it can find the CPU and that it is communicating.
7. Then it checks your RAM. This is a very basic check of whether it can communicate with the RAM.
8. Now it checks for keyboards and mouse. Depending upon the type of keyboard you have, you might see the keyboard’s lights flash. At this point you would normally see an indication on the screen of how you could enter the BIOS setup program in your computer. Each BIOS software vendor would have a different keystroke, but it is often either F2, F10 or DEL.
9. Your computer can be set to boot from your hard drive, or from your CD or a USB drive or even from the network.
10. If you want to boot from a CD or a USB device, you may need to change the boot order.
11. Most computers are setup to check their optical drives first. This makes it easier during new installs of operating systems.
12. Then they check their first hard drive, drive 0.
13. POST is looking for the MBR (Master Boot Record). This is always at Cylinder 0, Head 0, Sector 1, or 0, 0, 1. It points to the Boot Sector.
14. Once the MBR is found, the control is passed from the POST to the Operating System referenced in the MBR.

[cobreti]

"hey dr kleiner what does a computer when you hit the power button?"

[Traveldiary]

This video helped me clear one question asked by my interviewer about the boot process awesome

[solareclipse]

This video is about the importance of booting up your computer. It tells about the stages that a PC goes through when booting. It also talks about the ability to change the loading order, which may be useful for various government agencies.

[ajakayejoshua]

Love how your video is straight forward

[Velaryon]

This is brilliant and just exactly what some of us were looking for..

[AvadhootaYou]

Thanks for such precise, complete and short information which is hard to find these days..cheers man!

[jootyar]

The processor must be powered and work first for the program on the firmware (BIOS or UEFI) to run. Technically, the CPU is hard coded with a jump program that tells the processor where to find the UEFI.

[mikehunt]

this was an extremely competent presentation!

[SayiKiran]

I am wondering who plugged the Ram into a pcie slot!

[aryastark]

Thank you, my grade 4 students will now have an idea what am I talking about

[joel.]

Yeah the bios totally checks if there is a cpu. Like that makes sense.

[LightningFreezer]

Unfortunately not exactly enoegh would like to know how exactly the bios process is executed

[a.lollipop]

This taught me so much in so little time! Great video :)

[BossManTee]

Where is this animation from? what course?

[jeonghutamilim]

Buzzword of the day 7 years ago from today; forensic. Ps. Post stands for Power On Self Test, it is routine script in bios. It has nothing to do with anything else. Bios reads boot configuration and other stuff from cmos, then acts on it. So, when you push power button, it shorts transistor that latches to keep psu sleep pin grounded. Then whole pc gets power, but since cpu has no instructions in pipeline, it goes into sleep state. Meanwhile, bios rom was powered too and it has stuff to do according to it's built in configuration that starts with checking cmos for config. Then it runs POST and does other stuff until it is satisfied and checks boot devices in order as configured in cmos. It then reads first 446 sectors from disk in hopes of finding 1st stage bootloader. If it finds it, then it relinquishes hardware control to cpu by sending reset command with appropriate instructions to load bootloader from bootmedia.

[notsotastysandwich]

what does it do when you press the big red button on the computer? dr kleiner?

[forgameonly]

Which should come first, the BIOS or the POST? Why?

[cnorse]

Does this Correlate with the Bootstrap Process in computers?