The boot loader software is executed by the BIOS once located, and control of the computer is then passed to the operating system. Once the initialization task is complete, the BIOS checks the boot devices in order of configured preference (traditional default setting is the computer’s hard drive). ![]() The computer firmware conducts a power-on self-test of the system which is responsible for identifying system hardware and initializing components such as the CPU, hard drive(s), RAM, video card, mouse, and keyboard. ![]() The computer BIOS is the first programming code executed by a PC when the machine is rebooted or turned on.
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