Question about Computers & Internet

1 Answer

Boot sequence manual - Computers & Internet

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 44 Answers

When you hit the power button on your computer a whole lot of stuff happens. We call this the boot process. In the days when I first started using computers there was literally a "boot disk", a floppy (5.25" not a 3.5") disk that told the system where to go and what to do so that the operating system would start up. Since then the boot sequence has become somewhat more complicated. So let me take you thru the steps the computer takes to get started. For my example I'm going to use a Windows XP system.

  1. First is the POST, this stands for Power On Self Test, for the computer. This process tests memory as well as a number of other subsystems. You can usually monitor this as it runs each test. After that is complete the system will run POST for any device that has a BIOS (Basic Input-Output System). An AGP has its own BIOS, as do some network cards and various other devices.
  2. Once the POST is complete and the BIOS is sure that everything is working properly, the BIOS will then attempt to read the MBR (Master Boot Record). This is the first sector of the first hard drive (called the Master or HD0). When the MBR takes over it means that Windows is now in control.
  3. The MBR looks at the BOOT SECTOR (the first sector of the active partition). That is where NTLDR is located, NTLDR is the BOOT LOADER for Windows XP. NTLDR will allow memory addressing, initiate the file system, read the boot.ini and load the boot menu. NTLDR has to be in the root of the active partition as do NTDETECT.COM, BOOT.INI, BOOTSECT.DOS (for multi-OS booting) and NTBOOTDD.SYS (if you have SCSI adapters)
  4. Once XP is selected from the Boot Menu, NTLDR will run NTDETECT.COM, BOOT.INI and BOOTSECT.DOS to get the proper OS selected and loaded. The system starts in 16-bit real mode and then moves into 32-bit protected mode.
  5. NTLDR will then load NTOSKRNL.EXE and HAL.DLL. Effectively, these two files are windows XP. They must be located in %SystemRoot%System32.
  6. NTLDR reads the registry, chooses a hardware profile and authorizes device drivers, in that exact order.
  7. At this point NTOSKRNL.EXE takes over. It starts WINLOGON.EXE that in turn starts LSASS.EXE, this is the program that display the Logon screen so that you can logon.

Posted on Nov 05, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

How do I unlock the Bios on an Acer ES-1 111M Laptop


To boot from a CD, DVD or USB device, make sure that the device has boot sequence priority over the hard drive.

BIOS Boot

BIOS (Basic Input Output Subsystem) is a programmable chip that controls how information is passed to various devices in the computer system. A typical method to access the BIOS settings screen is to press ESC, F1, F2, F8 or F10 during the boot sequence.
BIOS settings allow you to run a boot sequence from a floppy drive, a hard drive, a CD-ROM drive or an external device. You may configure the order that your computer searches these physical devices for the boot sequence.
The first device in the order list has the first boot priority. For example, to boot from a CD-ROM drive instead of a hard drive, place the CD-ROM drive ahead of the hard drive in priority.
Before you set boot priority for a USB device, plug the device into a USB port.
To specify the boot sequence:
  1. Start the computer and press ESC, F1, F2, F8 or F10 during the initial startup screen. Depending on the BIOS manufacturer, a menu may appear.
  2. Choose to enter BIOS setup. The BIOS setup utility page appears.
  3. Use the arrow keys to select the BOOT tab. System devices appear in order of priority.
  4. To give a CD or DVD drive boot sequence priority over the hard drive, move it to the first position in the list.
  5. To give a USB device boot sequence priority over the hard drive, do the following:
    • Move the hard drive device to the top of the boot sequence list.
    • Expand the hard drive device to display all hard drives.
    • Move the USB device to the top of the list of hard drives.
  6. Save and exit the BIOS setup utility.
  7. The computer will restart with the changed settings.

Boot Priority Options

Some computer manufacturers allow you to select the device that contains the boot sequence from a special device selection menu. The example below uses a Dell system board.
To set boot priority using a device selection menu:
  1. When the computer starts to boot up, after the manufacturer's ID screen, press F12 several times. The device selection menu appears.
  2. Use the up and down arrows to select CD-ROM or

May 04, 2015 | Acer Aspire Computers & Internet

1 Answer

I have acer aspire 3000+ and cant change bios setup to boot first from cd rom and erecovery doesnt work


Why can't you change the bios setup to change the boot order or boot sequence?

Also you can change the boot order or boot sequence temporarily by just rebooting the laptop then watch the screen for which key it says to hit to change the boot sequence or boot order, then hit that key when you see the message.

May 08, 2012 | Computers & Internet

1 Answer

Winfast boot sequence problem


Boot sequence problem? You set the boot sequence permanently in the Bios or System Setup. Normally when you boot the system the screen will tell you what key to hit to get into the Bios or Systems Setup.

You can set the boot sequence temporarily (just for the current boot cycle) by watching the screen when you boot and it will tell you which key to hit to change the boot sequence or boot order.

May 07, 2012 | ASUS Computers & Internet

1 Answer

Toshiba Satellite Pro 4600 laptop


Just put the Recovery Disk in the drive and the system should start booting from it. If not, pay close attention to the screen and when it shows you which key to hit to change the boot order or boot sequence hit it. Change the boot sequence to read from the CD drive. This is a temporary change on the boot sequence.

If you want to make a permanent change to the boot order or boot sequence you will need to hit the key that says enter Bios or System Setup and change it there.

Apr 25, 2012 | Toshiba Computers & Internet

1 Answer

The screen won't turn on during boot-up


i had this problem on a certain brand of laptop,i finally refered to the owners manual to find FN-F5 toggled from the screen to external monitor depending on 1 click or 2 etc and that Fn-F1 put the screen into sleep mode the same way---im not suggesting your machine uses the same sequence keys but it might be worth a try finding out if you have accidently toggled your keys.
you could also be missing your OS or your bios boot sequence is incorrectly set--Press F2 whilst booting to get into boot sequence option of bios)-there navigate with tab or arrow keys--save and exit or reset settings to default and exit--dont change any thing in bios settings until you are familiar with how to navigate and select changes OK!

Oct 02, 2010 | HP Compaq Presario CQ50-110US Laptop

3 Answers

How to change boot for cd or hd


That is done in the bios.
you could also watch the boot sequencs and see if it says somthing along the lines "press F10 to change boot order"if so that is another option


If this info was useful please click

Aug 13, 2009 | Toshiba Satellite 2400-S251 Notebook

1 Answer

I have LG E500 and I want to instal XP. I cant make changes in bios like boot sequence, so I cant boot from cd and therefor I cant instal XP. What should I do?


I don't recommend downgrading your laptop from Vista to XP but...

According to manual, pressing F2 during boot sequence takes you to BIOS and then you can change
the order of the boot sequence in the BIOS. From the manual:

"...set passwords, change the booting order, and add new peripheral devices to the machine."

If you can't find boot sequence in BIOS setup, talk to a support rep online:

http://ca.lgservice.com/index_b2c.jsp

You may need to use a different server if not in CA.

Jul 08, 2009 | LG Computers & Internet

2 Answers

When i boot the computer what comes on the screen is (''award bootblock bios v1.0'' copyright(2) 2000, award software, inc bios rom checksum error detecting floppy drive A media insert system disk and...


it means your boot sequence is first booting your floppy drive or your hard disk is not detected.i think you should check the cmos set-up.you can set it by pressing delete while the pc is booting.disable floppy drive seek.also the boot sequence.the os installed is maybe corrupted, is also one of the problem. refer to the manual if you have.

May 16, 2009 | Computers & Internet

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

592 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

kakima

Level 3 Expert

100288 Answers

David Payne
David Payne

Level 3 Expert

14160 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...