Noises and vibrations
High pitched noises can be caused by electronic components. So I would Unplug your computer and remove the case and run the computer to discover the origin of noise. If a loose wire or faulty fan
here is a computer tower with everything removed from it 
Here is a photo of all the components I’ve taken out of the tower
I put all the components back in and connected everything backup. I was putting the fan back in and noticed one of preplers on the fan was cracked. So I decided to swap it for another one. Put other fan back in and screw the screws back in. I turned back on it started straight away to windows 7 desktop.
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