Windows 8 and 8.1 Forums


Changing IDE to AHCI caused no boot

  1. #1


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult

    Changing IDE to AHCI caused no boot


    The OS is installed while the mode was set for IDE, and afterward it was changed to AHCI. Now, the system does not boot. "Attempting repair" is displayed and the process does not advance.
    W8 is installed on a ssd and a hdd, and both exhibit the same symptom.
    The system includes GA-970A-UD3, FX-6300, DDR3 1866 4GBx2, 1TB SATA3 and 120GB SATA3 SSD.

      My System SpecsSystem Spec

  2. #2


    Posts : 22,582
    64-bit Windows 10


    Hello Churin,

    It would be best to set you BIOS to AHCI before installing Windows.

    You'll need to switch it back to IDE in BIOS for now so that Windows will be able to boot. Afterwards, you might see if using the tutorial below may be able to help.

    AHCI : Enable in Windows 7 / Vista - Windows 7 Help Forums

    Hope this helps,
    Shawn
      My System SpecsSystem Spec

  3. #3


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    Hellow Brink,

    msahci is in W7 but not in W8. The tutorial you referred to is for W7. Is there one for W8?
      My System SpecsSystem Spec

  4. #4


    Posts : 22,582
    64-bit Windows 10


    In that case, look for this in the registry instead in Windows 8.

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\StartOverride


    Change the 0 DWORD value from 3 to 0.

    Reboot, and change your SATA controller to AHCI in BIOS.

    You will boot into Windows with AHCI drivers.
      My System SpecsSystem Spec

  5. #5


    Posts : 1,121
    Windows 8.1 x64


    There is an alternate way to change from IDE to AHCI that might work on your system. But some warnings first.

    OEMs suggest reinstalling rather than changing, especially with an SSD.

    You stand the chance of loosing your install if something goes wrong, and different systems may behave differently.

    Not Recommended for Windows 7.


    While in Windows 8, open msconfig.exe and go to the boot tab and check Safe Boot. Click Apply and OK, and allow restart.

    Boot back into the Bios and change the controller to AHCI. Saving the change which will cause your system to reboot.

    This time, let it continue the boot into Safe Mode. While there, Windows 8 will install the AHCI drivers. You can check the SATA controllers in Device Manger to make sure if you want.

    Open msconfig.exe again and uncheck the Safe Boot box on the Boot tab.

    Reboot your system normally.

    I did not let my system run long after I changed mine, but I might expect some background housekeeping activity from the NTFS utilities. If something does not work correctly, then you might have to reset the controller to IDE to boot.
      My System SpecsSystem Spec

  6. #6


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    Pleased to report that both systems(W8-ssd and W8-hdd) now work under ahci mode.
    With W8-ssd there are two entries under StartOverride, 1 and 2. I changed both. With W8-hdd there is only one entry.
    I went through the Safe Mode for W8-ssd but I skipped that for W8-hdd and no problem happened. Since I had the backup image so that I wanted to try that.

    One question by passing: Is there no longer F8 available to have the system to boot in SAFE BOOT?
      My System SpecsSystem Spec

  7. #7


    Posts : 22,582
    64-bit Windows 10


    Great news Churin.

    It's a bit different to get to Safe Mode in Windows 8 now, but this can help show the different ways to do so.

    Safe Mode - Start Windows 8 in
      My System SpecsSystem Spec

  8. #8


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    The SAFE MODE is something I want to try when the system fails to boot. It appears the option 1 is the only way to do that. Am I correct? That seems to require sort of scary changes under command prompt.

    The tutorial, "How to Start Windows 8 in Safe Mode" appears not applicable when the system is in no boot situation. Exception to this is that the Safe Mode may be available if the Option One is implemented when the system is healthy. Is this correct?

    I created the W8 Repair Disk quite some times ago and I tried this for the first time but I could not find a way to have the system boot in Safe Mode.
    Last edited by Brink; 16 Mar 2013 at 14:13. Reason: merged
      My System SpecsSystem Spec

  9. #9


    Posts : 22,582
    64-bit Windows 10


    Churin,

    Sorry for the late reply. I've been doing some more testing to see if I may be able find another way.

    Currently the only way to boot to Safe Mode at boot only would be either option below. They only look scary, but they're not so bad. If you have any question about them to help feel more comfortable about doing one, then please just let me know.

    Last edited by Brink; 16 Mar 2013 at 20:29. Reason: link
      My System SpecsSystem Spec

  10. #10


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    "F8" noted in the last option in the list does not seem to be the same as that for W7 and earlier versions Windows.
    The three options appear to include those that need to be made available when the system is bootable. Which one of the three options does not require such advanced preparation?
      My System SpecsSystem Spec

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