BIOSPOST
BIOSPOST stands for Basic Input/Output System Power-On Self-Test. It is the initial diagnostic sequence executed by a computer's firmware when power is applied, designed to verify that essential hardware components are present and functioning before the operating system starts.
During POST, the firmware initializes the CPU, memory (RAM), chipset, timers, and basic I/O controllers, then tests
If a problem is detected, POST halts and communicates the error via audible beeps or LED/diagnostic codes,
Historically, POST was part of the legacy BIOS; modern systems use UEFI firmware that still performs POST
After a successful POST, control is handed to the boot device or boot manager, and the operating