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POST (which stands for Power-On Self Test) is executed by BIOS (Basic Input/Output System) every time the computer is turned on or reset, to make sure every important component is working properly and the system may proceed to boot operating system.

POST failure indicates a hardware problem. Depending on a way of indication (commonly, the mainboard speaker issues distinct series of sound signals to point at the source of malfunction), it may relate to a mainboard component, CPU, RAM, video card or an input device, such as keyboard.

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