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Started boot up memory
Power on self test in electronics equipment or computers is done to validate if all the critical parts of the device are working as desired when it is turned on. Any thing wrong internally or on an interface is typically reported as a failure on power on self test. What all is tested depends on how elaborately the power on self test has been designed. - Neeraj Sharma
no. OS is after Bootup which is after POST.
That would be during the POST (Power-On Self Test)
During the initial startup phase, right after your computer performs POST (power on self test)
The first step in the booting process is POST (power-on self-test).
The Power On Self Test is the series of operations that an electronic device performs after it has been switched on. These steps are very much dependant on the device and the manufacturer and are different in every type of electronic device.
Started boot up memory
POST stands for power on self test it does basic hardware checks on the computer
Power On Self Test
Self (Power-On Self Test)
Power on self test