My computer build now includes a piece of structural 8.5x11 printer paper.
I tracked the tapping noise to the case fan, poked at it a bit, and realized it got perfectly happy with just a bit of upward support. So, a bit of bridging between that and the top of the card cutouts just below, and I have a near-silent computer again! (Ignore the dust, that’s the next task.) #lowtechtech
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According to this article, the average temp for paper to ignite is ~230° C (or ~455° F, Fahrenheit 451 anyone?). Your PC will never reach those temps short of a serious electrical issue, and then you have bigger problems than a piece of paper burning up.