in order for a computer to successfully boot, its bios, operating system and hardware components must should be working properly. failure of any of those three elements will likely result in failed boot sequence.
when the computer power is first turned on , the CPU intializes itself,which is triggard by a serious
of lock ticks generated by the system clock. part of the cpu intaliziation is to look at the system ROM BIOS is the first instruction to start up programme . the ROM BIOS store is the first instruction which is the instruction to run the power on self test. post begins the check of BIOS chip and then test CMOS RAMif the post does not detecta bettery failure it then continious the CPU failure checking the hardware device, secondary storage device , pan drive , floppy drive,ports and other hardware device.
once the post has determined that all component are functioning properly and the cpu has succesfully initialized the BIOS looks for an os to load.
the bios tipycally looks to the CMOS chip to tell it where to find the OS and most pcs and the os loads from the c drives on the hard drive even though the BIOS has the capability to load the
os from a floppy disk.looking to the appropiate boot drive the bios will first encounter the boot record , which tell it when to find the begining of the os and the programme file that will intialize the OS.
Once the os intialize the BIOS copies its file into memory and rhe OS basically takes over controll of the boot process . now in controll the os perform the inventory of the system the memory and memory ability and loads the device drivers that its neds to control the pherepheral device such as a printer ,scanner , optocall device, mouse and keyboard.
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