Answer :

The power supply unit should be checked if the computer keeps turning off but the hard disk drive and RAM are positive.

The power supply unit is abbreviated as PSU and is the hardware component that performs the role of electric power supply to the computer as it converts the alternating current to low voltage direct current. A rectifier is the part of the power supply unit that converts alternating current to low voltage direct current. The transformer inside the power supply unit manages the voltage received by PSU while the part known as the voltage operator manages the direct current supplied by the power supply unit.

If the power supply unit is not working properly it may cause the computer to shut down arbitrarily as all the components of the computer require power and if they don't receive the desired power they won't function which will cause the computer to shut down. When the power supply unit is damaged, it may smoke if more than the normal amount of electricity passes through it.

A bad power supply unit generally does not affect the RAM or hard disk drive so if the RAM and hard disk are checked to be functioning properly then the power supply unit should be checked.

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