If no errors are found, it loads the basic device drivers and interrupt handlers for hardware such as the hard drive, keyboard, mouse, and a floppy drive. This chip contains information such as the system time and date and information about all the hardware installed in your computer.Īfter loading the CMOS information, the POST begins inspecting and comparing the system settings with what is installed in the computer. This chip is kept alive by the CMOS battery even when the computer is turned off. If the computer passes the POST, it looks at the first 64-bytes of memory located in the CMOS chip. For example, an irregular POST could generate no beeps or a combination of different beeps to indicate the cause of the failure. An irregular POST is a beep code that is different from the standard one or two beeps. If the computer does not pass any of these tests, it encounters an irregular POST.
This sequence makes sure the necessary components are present and functioning properly. When the computer first looks at the BIOS, it begins the power-on self-test ( POST). This number tells the CPU that it's ready to process the instructions at this location contained in the basic input/output system ( BIOS). While this is happening, the processor clears any leftover data in the memory registers and gives the CPU program counter a F000 hexadecimal number. Once the computer and its components have ample power and the power supply reports no errors, it sends a signal (using transistors) to the motherboard and the computer processor ( CPU). This power supplies the computer and its components with the proper amount of voltage and electricity. When you first press the power button, the computer sends a signal to the computer power supply, which converts the AC (alternating current) to DC (direct current). This page is created to give you a better understanding of how the personal computer works starting when you press the power button.
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