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The BIOS software has a number of different roles, but its most important role is to load the operating system.
When you turn on your computer and the microprocessor tries to execute its first instruction, it has to get that instruction from somewhere.
For example, when you press a key on your keyboard, the signal is sent to the keyboard interrupt handler, which tells the CPU what it is and passes it on to the operating system.
The device drivers are other pieces of software that identify the base hardware components such as keyboard, mouse, hard drive and floppy drive.
An error at this point is almost always a hardware problem.
On many machines, the BIOS displays text describing things like the amount of memory installed in your computer, the type of hard disk and so on.
It turns out that, during this boot sequence, the BIOS is doing a remarkable amount of work to get your computer ready to run.
It checks the PS/2 ports or USB ports for a keyboard and a mouse.
It looks for a peripheral component interconnect (PCI) bus and, if it finds one, checks all the PCI cards.