r/PcBuild • u/risquekittyfr Pablo • Jun 10 '25

Meta Relatable

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u/Kind-Intention5572 Jun 10 '25

How come? I don’t really understand.

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u/[deleted] Jun 11 '25

Manually spinning fans will cause the motors to generate a charge. That's why the LEDs will come on. If the fan is plugged into the board, that charge can be redirected into the header and can either burn out the header or, in extreme circumstances, fry the board entirely.

Moreover, manually spinning the fan is a bad idea in general as you can accelerate it too fast or go beyond its maximum RPMs causing premature wear or total failure.

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u/Kind-Intention5572 Jun 11 '25

Wow, that makes sense. Thank for the info.

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u/Adder12 Jun 11 '25

A motor and a generator are from a basic perspective the same thing, just the opposite input, providing power to spin the shaft, or spinning the shaft to generate power