The cooling Fan is running and there is a wire touching it making this noise.
Hard drive spinning fast but it shouldn't be persistent!.
Clogged/hard dust in the cooling Fan can cause this, so have a look in and
be sure nothing touching the cooling have from wires or ribbon cables.
Don't poke for a long and don't touch any components other than the wires
and ribbon cable you may fry a component by your ESD (Electro static
Discharge).
Also check your sound scheme/ volumes or speakers.
HTH.
Let us know.
Regards,
nass
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