Cannot Boot To BIOS Setup (F2) or One-Time Boot Sequence Options (F12)

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  1. Posts : 97
    Windows 10 x64 (Version 20H2) Updated
       #1

    Cannot Boot To BIOS Setup (F2) or One-Time Boot Sequence Options (F12)


    Cannot Boot To BIOS Setup (F2) or One-Time Boot Sequence Options (F12)-dellt5810a.jpg
    I have tried all these and still can't get into BIOS setup or One-Time Boot Sequence.

    1. First off, F2 or F12 does not work.
    2. F2 right after the keyboard light comes on.
    3. Continuous tapping of the F2 key, will cause the desktop not boot at all.
    4. Continuous tapping of the F12 key, will cause the desktop not boot at all.
    5. Cannot flash the BIOS to a more current version since F12 will not work to select the USB.
    6. powercfg /h off
    7. Disabled Fast Startup.

    8. https://www.dell.com/support/article...system?lang=en

    9. Four Methods to Access UEFI BIOS Setup in Windows 8/10 PC/Laptop/Tablet

    10.
    Cannot Boot To BIOS Setup (F2) or One-Time Boot Sequence Options (F12)-dellt5810b.jpg
      My Computer

  2. hsehestedt's Avatar
    Posts : 2,352
    Windows 10 Pro, 20H2
       #2

    On many laptops, to access the F1 through F12 keys you need to press and hold the "Fn" key while pressing the function key. This is because these keys often serve 2 purposes. For example, in addition to serving as the fucntion key, the same key may adjust volume, screen brightness, keyboard backlighting, etc.

    Try press Fn + F2 or Fn + F12 and see if that works.

    I know you are using a TowerPC and not a laptop, but this may still apply.
      My Computers


  3. Posts : 97
    Windows 10 x64 (Version 20H2) Updated
    Thread Starter
       #3

    hsehestedt said:
    On many laptops, to access the F1 through F12 keys you need to press and hold the "Fn" key while pressing the function key. This is because these keys often serve 2 purposes. For example, in addition to serving as the fucntion key, the same key may adjust volume, screen brightness, keyboard backlighting, etc.
    Try press Fn + F2 or Fn + F12 and see if that works.
    I know you are using a TowerPC and not a laptop, but this may still apply.
    But desktop keyboard don't have the "Fn" key!
      My Computer

  4. Bastet's Avatar
    Posts : 1,864
    Windows 10 Pro 64bit
       #4

    You should be rapidly clicking/pressing the F12 key as soon as you see the manufacturer’s logo, clicking when the keyboard light comes on may be too late.

    Can you try a different keyboard?
      My Computer


  5. Posts : 359
    windows 10
       #5

    I had this problem with my dell laptop. It is an option in the bios which poses a problem but I do not know which option. Perhaps "Enable Legacy Operation ROMs" which by default should be disabled.
    Access the bios from windows and restore the default values by remembering the values that you have changed and that you will reset after testing F2 and f12.


    Same as your link:
    How to enter UEFI (BIOS) on Windows 10 PCs | Windows Central
      My Computer

  6. NavyLCDR's Avatar
    Posts : 15,784
    Windows 10 Pro
       #6

    When you shutdown Windows, hold down the Shift key when you click on shutdown. This bypasses Windows 10 Fast Startup which interferes with getting into BIOS settings.
      My Computer

  7. hsehestedt's Avatar
    Posts : 2,352
    Windows 10 Pro, 20H2
       #7

    caxtin said:
    But desktop keyboard don't have the "Fn" key!
    Then this does not apply to your system. a few desktops do have the Fn key, but it is admittedly not common.
      My Computers

  8. Bastet's Avatar
    Posts : 1,864
    Windows 10 Pro 64bit
       #8

    What’s the make of the external keyboard? I’ve never heard of any keyboard without a Fn key.
      My Computer

  9. NavyLCDR's Avatar
    Posts : 15,784
    Windows 10 Pro
       #9

    Bastet said:
    What’s the make of the external keyboard? I’ve never heard of any keyboard without a Fn key.
    Almost all desktop keyboards have no Fn key.
      My Computer

  10. Bastet's Avatar
    Posts : 1,864
    Windows 10 Pro 64bit
       #10

    NavyLCDR said:
    Almost all desktop keyboards have no Fn key.
    Thanks NavyLCDR. It’s been a long time since I used a desktop PC but do use an external keyboard with my laptop which does have a Fn key.
    However in the photo you’ve posted the Fn key is there & the text is Orange.
    Strange, the photo is now missing, I was going to point out where it was.

    My keyboard is a K800.
      My Computer


 
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