Question static or wired Elctricity sound !

Feb 20, 2019
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Hello I have a problem with my laptop
I can hear a sound of wired and static electricity coming from the motherboard and it increase when the laptop is plugged in. and go away when turn off or sleep only
what may cause this sound and how it is harmful or not ?
sorry for my English Cuz I am Egyptian
my laptop is Acer nitro 5
and it is still in warranty but I live in Egypt and I canot send it to USA to use my warranty .