However, how the POST is handled and the types of errors thrown can be modified by the Vendor as per the system requirements. The POST sequence is executed irrespective of the Operating System. If there are any errors in the POST the system would fail to proceed towards the next steps(boot process) as it would throw a fatal error.

Basic System Devices like keyboard, and other peripheral devices.

Hardware elements like processor, storage devices and memory.

The Boot loader performs POST as a preboot sequence and if everything is working well without any errors the BIOS(Basic Input Output System) is activated which finds and loads the operating system. The boot process is initiated when the power button is pressed, it sends power to the boot-loader in the cache memory. The boot sequence is the process of starting a computer/system.

Bootstrapping starts the initialization of the OS. When POST is successfully finalized, bootstrapping is enabled. Once the tests are passed the POST would generally notify the OS with beeps while the number of beeps can vary from system to system. POST sequence is executed irrespective of the Operating System and is handled by the system BIOS. The process would proceed further only if the required hardware is working correctly, else the BIOS(Basic Input Output Software) would issue an error message.

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