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PC Construction Rule
(lemmy.world)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Pointing a desk fan into a computer works fine and is a useful troubleshooting step if you suspect something is overheating, but if you need to do it that probably means heatsinks are clogged with dust, aren't sized appropriately or aren't making good contact. So you really should fix that problem.