Power-on Self Test (POST) From BIOS to UEFI: A Technological Leap. The transition from traditional BIOS to UEFI (Unified Extensible Firmware Interface) marked a significant leap in POST's capabilities. UEFI, with its advanced features and faster boot times, brought a more sophisticated approach to POST. It offered more detailed diagnostics.. Power on self-test (POST) is a system diagnostic process that is carried out by the BIOS right after you power on the computer. The main function of this test is to see if the components connected to your computer are functioning well. POST checks the hardware components installed on your computers such as the RAM, hard drive, processor, and.

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The computer POST (power-on self-test) checks a computer's internal hardware for compatibility and connection before starting the remainder of the boot process. If the computer passes the POST, the computer may give a single beep (some computers may beep twice) as it starts and continues to boot.. POST stands for Power-On Self Test. As the name suggests, it's a process that occurs when the computer is powered on. When your computer first turns on, the first thing that actually initiates is the system's BIOS. This stands for Basic Input/Output System. The BIOS is a bit of software that resides in a chip on the motherboard.