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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.
First answer by Jason Hankins. Last edit by Jason Hankins. Question popularity: 74 [recommend question]
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