Windows 8 and 8.1 Forums


Mobo give startup code 40 when booting?

  1. #1


    Posts : 24
    8.1 pro

    Mobo give startup code 40 when booting?


    Every time i turn my PC on, it will show post code 40 and my stable 4.6ghz OC will be at stock speeds like nothing took in the BIOS. I've ran countless programs to verify my OC so i'm fairly certain its not the cause. If i reboot my machine, everything comes out fine and ill have a post code of AA which is what i want.

    it would be nice to turn on my machine in the morning without having to reboot it after it gets to the desktop. Could this be a windows problem or hardware issue?

    thanks for any help.

      My System SpecsSystem Spec

  2. #2


    Hi there. I found this page explaining codes with solutions, although not sure if it relates to your problem. Hope it helps you.

    Error codes in Device Manager in Windows
      My System SpecsSystem Spec

  3. #3


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    If that code 40 is a BIOS error message, then I do not believe its a Windows issue. If the motherboard won't post the OS isn't loaded so its not a factor. Your overclock may have been stable but if you have overstressed your hardware it can become unstable. Back it off a bit and see if the error goes away. Filling in your system specs will help immensely. Not knowing what motherboard you have hinders things.
      My System SpecsSystem Spec

  4. #4


    Posts : 1,121
    Windows 8.1 x64


    My motherboard has a display for 2 digit codes and 40 is ACPI/ASL Checkpoints and means the system is waking up from an S4 sleep state.

    I do not know if this is the same as your setup, since I do not know what your setup is.. If that is correct, I think S4 is hibernation. Could you try not letting it hibernate?
      My System SpecsSystem Spec

  5. #5


    Posts : 24
    8.1 pro


    Thanks guys i did a little research and its a Windows 8 sleep state action that happens during a cold boot. It can be fixed by disabling this option.

    My specs are as follows:

    ASUS Rampage IV extreme
    i7 3930k @4.6 at 1.36v
    32 gb Dominator platinum 2000mhz at 1600mhz.
    2x Samsung 840 pro 256 SSD's in Raid 0
    1x Crucial 128 gb SSD
    4TB external WD mybook


    Power options>system settings>uncheck "turn on fast start up (recommended)" under shut down settings.
      My System SpecsSystem Spec

  6. #6


    Good that you got it fixed.

    Thanks for posting the solution. Very considerate of you.
      My System SpecsSystem Spec

  7. #7


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Ops, looks like I got it wrong, Glad you got it sorted though.
      My System SpecsSystem Spec

  8. #8


    Posts : 24
    8.1 pro


    no it was close and got me thinking to GTS it haha. Thanks for the reply
      My System SpecsSystem Spec

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