The Central Processing Unit or CPU and its registers among others. It is actually done to determine whether or not the following components of the computer system are functioning properly: This operation is usually carried out by the firmware of the computer which can be The Basic Input Output system or BIOS, the Unified Extensible Firmware Interface or UEFI or any other system. This test is always the first step of booting a device and it will run when you just switch it on for the first time after a few days or restart it regardless of whether the operating system is installed or not because it is handled by the BIOS. The Power-On Self Test is actually a process which involves a series of built-in analytical tests performed by a computer when it is turned on. POST tests can help in troubleshooting different errors such as in memory refresh timer, parity, display memory, base read or write memory, cache memory, motherboard timer and others. 
However, it may vary from one system to another. These beeps vary in number and depending on the number of beeps, the error is identified. If everything is found okay during the tests, the operating system is notified with beeps so that it starts functioning.The tests are handled by the BIOS and error messages are sent if the hard drive, disk drive, RAM, CPU and other hardware devices are not found or are identified but are found to be not working properly.It is only when this testing process is concluded, bootstrapping and other processes are initiated which sets off the operating system.Power on Self Test is a part of the pre-boot sequence of the device or devices to find out whether the hardware is functioning as it is desired.
Technically, it refers to the systematic check of the basic devices of the computer where the BIOS displays the codes usually at the bottom right corner of the screen when the test progresses enough to initialize the video editor. It is executed irrespective of the operating system.
Conclusion What is Power on Self Test (POST)?Ī Power on Self Test, commonly referred to as POST, refers to the series of tests conducted by the software or firmware as soon as a computer is switched on to find out whether or not the hardware of the computer is functioning properly. Understanding Power on Self Test (POST).
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