What is electrical requirement ?

Dont worry , it is not a dangerous word to get frightened.It is the requirements to run your PC.Most of the hard disks in your PC gets damaged , and your data will be lost.This is one of the problem arising.

What is the reason ?

Lack or improper earth wire connection is the cause.Yes , if the earth wire connection is not in a proper condition the hard disk gets damaged.
Check it with the help of an electrician and fix it.

How can it be detected ?

It can be detected if you touch the CPU , if earth wire connection is not in a proper condition , you receive an electric shock. 

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