Windows 10: Windows 10 upgrade failure Solved

  1.    16 Jun 2016 #1

    Windows 10 upgrade failure

    Hi - I had a working PC with Windows 8.1. I set it to download Windows 10 overnight, and the next morning the PC is unresponsive. It seems to have tried to install Windows 10, even though I said only download. Now I can't boot, and get "inaccessible boot device". What is this? I can't even reset back to the "previous build". Help :-(
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  2.    16 Jun 2016 #2

    I found out that I had to go into the BIOS and set the "SATA Mode Selection" to "IDE Mode". The original "AHCI Mode" does not work with Windows 10. (Windows 10 had also reset the BIOS clock to 2014 - odd).
    Anyway, I'm happy it seems to working now. I've upgraded several machines without issue, so I was a bit worried for a while there
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  3. hTconeM9user's Avatar
    Posts : 2,678
    Windows 10x64 Home Version 1803 (Build 17134) 345
       16 Jun 2016 #3

    Glad you got it sorted
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  4.    16 Jun 2016 #4

    There's two things wrong here - first, AHCI mode is the preferred mode for Windows 10 to operate in, not IDE. Second, Windows will not change the disk controller mode and it will upgrade to whatever mode was set before - if it was set to AHCI mode in the previous Windows, it would stay AHCI mode after the upgrade and work the way it is supposed to. If it was set to IDE mode in the previous Windows, it would stay IDE mode after the upgrade and work the way it is supposed to. Changing the disk controller mode from AHCI to IDE or IDE to AHCI requires Windows to be restarted in safe mode after the change is made in bios, and then restarted in normal mode to pick up the change.

    Also, the upgrade to Windows 10 would not have changed the clock to 2014.

    What I suspect happened is the CMOS battery is weak or dead and the bios reset itself to defaults during an interruption in power and if it were me, I would replace it.

    I would also change the disk controller mode to AHCI. Before changing the setting in bios, the user needs to set the reboot to be into safe mode using MSCONFIG and the user also needs to shut down the computer by holding down the shift key when clicking shutdown from the power icon to ensure the computer shuts down fully and not just in the "fast startup" mode. Then turn on the computer, press the key to enter bios setup, change to AHCI, let it boot into safe mode. Go back to MSCONFIG and set it boot normally then reboot.
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  5.    16 Jun 2016 #5

    OK - thanks for your comments. Sounds very plausible, so I'll check the battery. If it is the battery, it's incredibly bad luck it died just when I was installing Windows 10.
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