Your Computer system’s BIOS (Basic Input/Output System) is firmware that is stored in a chip on your motherboard which is responsible for handling basic system start-up — In essence, it gets your computer’s hardware ready so that the operating system can be loaded. Some persons sees it as being a small operating system in its own right.
It is important to understand that the BIOS runs before the operating system runs, and handles the basic tasks of recognizing and configuring the various pieces of hardware you have installed, from RAM to optical drive. It means if you have a bad or faulty BIOS, you have a dead computer.
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