Windows 10: Strange Boot Failure - Why?

  1.    25 Nov 2017 #1

    Strange Boot Failure - Why?


    My desktop PC (Gigabyte GA-Z77X-UD5H) failed to boot yesterday. There was no video output nor an error beep although the power on LED was lit. Power to the motherboard was good but the boot hung with error code d6 which is No Console Output Devices are Found.

    I removed the Sapphire GPU to try the onboard Intel GPU and had the same error. I then removed the CMOS battery which showed 3V and replaced it with a new one showing 3.2V. This would also set the BIOS to default values. The PC then booted so I loaded the BIOS defaults then reset my BIOS settings. All is now fine.

    I'm mystified why this happened - any ideas? Did the low CMOS battery voltage corrupt the BIOS data in some way (but a dud battery usually just results in the date/time being reset)?
      My ComputersSystem Spec

  2.    25 Nov 2017 #2

    It's most likely you had some BIOS/UEFI corruption and by removing battery it was back to defaults. Battery should be good to about 2.9v but clock itself may work at even lower voltage. To keep other settings takes higher voltage.
      My ComputersSystem Spec

  3.    25 Nov 2017 #3

    CountMike said: View Post
    It's most likely you had some BIOS/UEFI corruption and by removing battery it was back to defaults. Battery should be good to about 2.9v but clock itself may work at even lower voltage. To keep other settings takes higher voltage.
    What would cause a BIOS corruption? Perhaps a spike on the power line or a cosmic ray?
      My ComputersSystem Spec

  4.    25 Nov 2017 #4

    Steve C said: View Post
    What would cause a BIOS corruption? Perhaps a spike on the power line or a cosmic ray?
    Or UEFI partition.
      My ComputersSystem Spec

  5.    25 Nov 2017 #5

    CountMike said: View Post
    Or UEFI partition.
    Please explain. The boot failed mid way through the boot process well before any attempt was made to load Windows.
      My ComputersSystem Spec

  6.    25 Nov 2017 #6

    BIOS still looks for an UEFI partition if set to CSM Auto and not Legacy mode.
      My ComputersSystem Spec


 

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