POST

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The first phase of typical POST (AMI BIOS) Second phase of typical POST (AMI BIOS)

Power-on self-test (POST) is a type of test for the performance of basic components: RAM, graphics, hard disks, or CPUs executed at startup or reboot. PC PCs

The POST test is performed in several phases. Phase one is to check the presence and correct operation of the systems necessary for computer operation. No expansion card is available at this stage, and errors are communicated by the PC speaker located in the system unit housing. First of all, it tests the performance of the processor, RAM and graphics card. The unfortunate result of the POST is the result of a series of noises from the loudspeaker. These voices, and more precisely their number and duration, are the error codes. Using this manual you can determine what is causing the problem. Modern motherboards instead of using a fairly uncomfortable sound code report the result of the POST test using color LEDs or a seven-segment display on the motherboard. Another solution is voice prompts (recorded by the teacher and recorded in a special chip on the motherboard). The next POST step that is performed after most of the components are initialized consists of a RAM test and a hard disk test. When the POST finishes and no errors are found, the computer will issue a single beep (rarely two) and start the operating system boot process.

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