How Your Computer Starts

Every computer follows a standard boot sequence when it starts up. BIOS (Basic Input Output System) The CPU runs an instruction in memory for the BIOS. This is a Jump instruction that transfers the Instruction Pointer to the code of the BIOS start-up program. The BIOS runs the Power On Self Test. It is a process performed by firmware or software routines immediately after a computer or any digital device is powered on.