I have an old Inspiron 8200
Everything is working fine, except when there is no power source connected, it makes a buzzing noise. (No AC or battery)
It sounds like its coming from around the area were the media keys are located.
It doesnt make the noise EVERY time no pwer is connected, but it does make it most of the time.
It goes away after a few minutes tho.
Just worried if something is going to die on me soon.
Well, if anybody knows anything, please tell me.