If any errors occur, the BIOS/UEFI reports them as part of the testing stage, known as the power-on self-test (POST). It tests and initializes components such as the processor, RAM, video card, hard drives, optical, and USB drives. It prepares the machine by testing it during bootup and paves the way for the operating system to start. This boot firmware, also known as System BIOS or, on most recent systems, unified extensible firmware interface (UEFI), is the first code run by a computer when it is booted. ![]() ![]() The Basic Input/Output System (BIOS) is an essential component of the motherboard. Using BIOS/UEFI Diagnostics-In this section, you learn about diagnostic features built into many BIOS/UEFI chips. Introduction to BIOS/UEFI-This section explains the motherboard’s firmware, known as the BIOS or UEFI.īIOS/UEFI Configuration-This section demonstrates how to access the BIOS and modify settings for example, RAM, processor, and video settings.įlash Upgrade BIOS/UEFI-In this section, you learn how to upgrade the BIOS through a process known as flashing. This chapter covers the following subjects: CompTIA A+ 220-901 and 220-902 Cert Guide, 4th Edition
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