What happens when you boot up a computer?

Answer 1

Answer

The computer gets power from the power suply inside the computer. from there the computer's bios kicks on and starts the CMOS program that is programmed into the BIOS chip. the CMOS program then begins to quickly check all the hardware. first it checks what kind of processor is in the computer, then counts the memory. It then checks the drives such as cdrom and harddrives then floppy. then it checks all the pci, isa, etc. cards and any other devices in the computer and gives each an irq (interrupt request). then the Bios (on most computers) checks first to see if theres a floppy in the drive and if so is it bootable and if so boots from the floppy. If the floppy is not bootable it then looks on the first hard drive's MBR (Master Boot Record) to see if its bootable and if so then boots to that drive.. if that one is not then keeps checking until it either finds a bootable harddrive or tells the user no drives are bootable and usually asks to insert a bootable floppy or restart the computer.

Answer 2

My computer hits me in the face when I turn it on. I hit it back, and we allways get in a fight.

Bill's answer ...

When you first turn your computer on, the only thing it's capable of doing is finding the BIOS (Basic Input Output System) ROM (Read Only Memory) chip on your mainboard. This BIOS chip has a program burned onto it that knows where to look for, and how to access, the different expansion slots, ports, drives, and the Operating System.

The computer begins the start up process (or boot sequence). It loads the programming code and instructions on the BIOS chip into memory and then carries out the instructions in order. It takes an internal and external inventory of equipment and performs several self-tests (called POWER ON SELF TESTS).

Answer 3

A lot of things happen when you start your computer. Also, it's a little different for several kinds of computers. And also, keep in mind I'm not a technician or engineer.

After pressing the power button the motherboard on the computer tells the power supply unit to start up. The power supply starts up and powers the computer's hard drives, CD or DVD drives, motherboard, and misc.

The motherboard's BIOS (Basic Input/Output System) begins executing basic commands required to start the computer and also diagnostics. Some of those may be checking the RAM (Random Access Memory) to make sure it is not damaged, checking to see if any new RAM or devices have been installed while it was turned off, checking to see if the keyboard and mouse are working, and more.

After this, the BIOS allows the hard drive on the computer to take over by telling the hard drive to execute its Boot Sector. The Boot Sector has the initial commands to start booting up the Operating System (such as Microsoft Windows). Basic files needed to run the operating system are loaded into memory (RAM) and once they are loaded the Operating System is ready and starts.

Once you are at your desktop (after logging in if you have a password) the computer still may be loading programs that you have in the background and this can take up to a couple of minutes to complete.

Finally, the computer is ready. Everything is loaded into memory and it is waiting any commands from the user.

There are many more details, but these are the basics about what goes on during boot up. Hope this helps.

Answer 4

When a computer is switched on it will warm up by showing all the logo screens and soon come up to a screen when you put in your username and password

Answer 5

It depends on your operating system. Also, with the exception of Linux, BSD, and similar operating system, No-one except the developers knows that.

Answer 6

You turn it on You turn it on

Answer 7

your going to waist power

Answer 8

Test

Answer 9

It boots