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Fans keep spinning after shutdown (X299 UD4)

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  • Fans keep spinning after shutdown (X299 UD4)

    Recently completed a new build where everything works fine, case fans and CPU-fan runs quietly during operation.

    But... when I shutdown the computer (either in Windows or by the case on/off button), Windows shuts down nicely but then all fans (case fans GPU and CPU fan) rev up a couple of notches and stay on. And will stay on forever.
    This is not as if it was going through a "cooling down phase" or anything.
    When I hit the power button again, all fans rev down and system boots fine.

    Have checked all the power related features in Windows and what I can see in BIOS and system is not going into hibernation or anything as far as I can tell.

    Any suggestions on what to try?

    X299-UD4 MB,
    F4 BIOS
    i9-7980EX CPU
    64 GB RAM
    GTX 1060 graphics card
    A couple of USB units plugged in.
    Power Supply is a Cooler Master Pro Gold, 1000W from 2011 which worked fine in the previous build for all these years.

    • No overclocking, BIOS is pretty much at default (Auto) values for everything.
    • Soundcard disabled in BIOS
    • Intel RST enabled in BIOS (running 3 RAID0 volumes).
    • Temps are around 30-40 degrees during use. System is (now) runing with case sides removed so it's definitely not overheating.
    • I have tried clearing CMOS and replaced CMOS battery (which was below 3V from factory).
    • I have tried unplugging USB devices with no difference.
    • Also noted that if I power down completely with the switch on the PSU (naturally all fans shut down) and power back up, BIOS thinks CMOS has been reset even though CMOS battery is fresh.

  • #2
    Re: Fans keep spinning after shutdown (X299 UD4) [SOLVED]

    Solved.
    Replaced Power Supply (w. a Seasonic Prime Gold 850W) and now everything shuts down completely, both with a case power switch toggle and power down in Windows.

    Originally posted by Swede1 View Post
    Recently completed a new build where everything works fine, case fans and CPU-fan runs quietly during operation.

    But... when I shutdown the computer (either in Windows or by the case on/off button), Windows shuts down nicely but then all fans (case fans GPU and CPU fan) rev up a couple of notches and stay on. And will stay on forever.
    This is not as if it was going through a "cooling down phase" or anything.
    When I hit the power button again, all fans rev down and system boots fine.

    Have checked all the power related features in Windows and what I can see in BIOS and system is not going into hibernation or anything as far as I can tell.

    Any suggestions on what to try?

    X299-UD4 MB,
    F4 BIOS
    i9-7980EX CPU
    64 GB RAM
    GTX 1060 graphics card
    A couple of USB units plugged in.
    Power Supply is a Cooler Master Pro Gold, 1000W from 2011 which worked fine in the previous build for all these years.

    • No overclocking, BIOS is pretty much at default (Auto) values for everything.
    • Soundcard disabled in BIOS
    • Intel RST enabled in BIOS (running 3 RAID0 volumes).
    • Temps are around 30-40 degrees during use. System is (now) runing with case sides removed so it's definitely not overheating.
    • I have tried clearing CMOS and replaced CMOS battery (which was below 3V from factory).
    • I have tried unplugging USB devices with no difference.
    • Also noted that if I power down completely with the switch on the PSU (naturally all fans shut down) and power back up, BIOS thinks CMOS has been reset even though CMOS battery is fresh.

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