Reduce Computer Sound
To Be A Legitament answer put a small cheap fan right next to ur pc and run it with monitor off for 1 day.
with fan facing out to clean it
with fan facing out to clean it

Turn off your computer
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PROFIT
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PROFIT
Any sort of sound deadening material, although it'll add a shit ton of weight to your case. You can even find people that are willing to rhinoline anything you want rhinolined.

