What is POST, Fatal error, Non-Fatal error and How to Fix fatal Error?

 POST

        Post stands for Power-On Self Test. Post is the diagnostic testing sequence that runs to determine if the computer is working properly.

                    It tests the computer parts such as: Keyboard, RAM, Disk drives and other hardware. If the necessary hardware is working fine, the computer begins to boot.

                    If the necessary hardware is working fine, the computer begins to boot.

                    

                    If the necessary hardware is not working fine, then BIOS issues an error in two ways:

• Error message is displayed
• Series of beep sounds

                    Depending on the type of error it is divided into two types:

1. Fatal Error
2. Non-Fatal Error

Fatal Error

            A fatal error halts the boot process immediately.                                              Ex: No system memory is found.

              POST tests a vital system component, that's why most POST boot errors are fatal.

Non-Fatal Error

                       Booting process doesn't stop when it encounters non-fatal error. It displays an error on the screen.

Fix Fatal Error

• Switched off the computer power and open the system case.
• Clear CMOS by removing the CMOS battery.
• Switch on the computer and go to the BIOS setup.
• Re-configure the BIOS settings to default and SAVE CHANGES & EXIT.
• After the reboot, computer should start normally.