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Powered off PC fan twitches and turns

By cadd
Jul 27, 2009
  1. Is this a sign of bad PSU or bad motherboard?

    When my PC is shut down, after a few seconds later, the CPU fan starts twiching, then the chassis fan does the same. A little later, both fans start turning slowly.

    When I turn the PC on, everything is normal. After shut off, the same thing.

    I heard that sometimes a temperature sensor forces the fans to turn even when powered down. Is this it? But the fans keep turning indefinitely once they stop twitching and start turning.

    The twitching noise is very annoying. I have to cut the power off from the switch at the back of the PSU. Of course that will drain my clock battery sooner and I now have to use two switches (one from PSU and one at the front as usual.)
     
  2. raybay

    raybay TS Evangelist Posts: 7,241   +9

    We have seen a lot of things, but that is one story that I guess we will have to believe your telling...
     
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