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HP Probook UEFI Mode in Legacy Mode

Donkev -  
flo88 Posted messages 28494 Registration date   Status Contributor Last intervention   -
Hello,

I need help please, I switched my HP ProBook from UEFI mode to legacy mode, and now at startup it shows a black screen with system diagnostics. I'm unable to exit this diagnostics screen; no matter what key I press, it takes me back to the diagnostics. It prevents me from accessing the BIOS, and I don't know what to do anymore...

16 answers

  1.
    epango Posted messages 37195 Registration date   Status Member Last intervention   Ambassadeur 4 270
     
    Why did you change the UEFI mode to Legacy mode?

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    1. Donkev
       
      Hello Sir, I wanted to boot my PC from my bootable USB drive, but it didn't show my USB even after changing the priority order and disabling secure boot. My boot is in UEFI, so I formatted my USB to GPT but still no detection. Then I made the wrong decision to switch to legacy mode and boot my USB in MBR, but now I'm stuck on the error message I mentioned above.
      After that, it always brings me back to the diagnostics, so there's no way to access the BIOS.
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  2. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    RE_

    However, you had already created the key in GPT 
    My PC is in UEFI, so I booted in GPT, but my key does not appear; I changed the key, but alas


    As mentioned earlier, check if the HDD is detected in the BIOS because it looks like a dead HDD

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    1. Donkev
       
      No, it's not detected, it's just the key. My hypotheses are either the hard drive is poorly fixed, but it's a new PC that has never been opened, so I don't think that's it, or a virus has damaged the hard drive.
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  3. flo88 Posted messages 28494 Registration date   Status Contributor Last intervention   Ambassadeur 5 171
     
    Hello,

    When the diagnostic screen appears
    Press and hold the power button for several seconds until the PC turns off, wait a moment and turn it back on, access to the BIOS should again be possible with the appropriate key

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    1. Donkev
       
      Thank you, Mr., for your intervention, and well, I did it but I still land on this damn diagnostic no matter which key I press, F1, F2, F3....

      There's also another detail that I forgot to mention and I apologize, before the diagnostic I first get the message
      "boot device not found, please install an operating system on your hard disk,
      Hard disk - (3F0).."

      Then no matter which key I press next, it takes me back to this diagnostic.
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  4. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    Hello,

    Remove the hard drive and restart the PC, you will definitely get to the BIOS

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    1. Donkev
       
      Thank you for your intervention, I solved the diagnostic problem by simultaneously holding down the CTRL + ALT + DEL + F1 keys and I now have access to the BIOS, but I’ve returned to the starting point of the invisibility of my bootable USB drive.
      My PC is in UEFI mode so I booted in GPT but my USB drive does not appear, I changed the USB drive but unfortunately...
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  6. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    How did you create it? With RUFUS? Have you tried another drive or a different USB port?

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    1. Donkev
       
      Yes Rufus, yes it's the second key. Yes, I tried with another port.
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  7. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    What did you want to do with the key?

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    1. Donkev
       
      I want to redo the PC system, the old system was erased somehow, but I have other boot options but no USB drive.
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  8. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    Do you mean that you can no longer boot into Windows?

    Are you still able to access the advanced options (blue screen)?

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    1. Donkev
       
      Yes, I can no longer boot into Windows,
      Right before arriving at the advanced options, the drive where my system is loaded needs to be displayed; that is my problem.
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  9. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    Let's start over.

    If you don't plug in the key, what do you end up with?

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    1. Donkev
       
      Without a key, nothing changes; it's as if she had never been there.
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  10. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    It's not what I'm asking. What's happening on the screen? What are you arriving at?

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    1. Donkev
       
      When I turn on the PC, I get the message

      "No bootable image found, notebook will now shutdown"
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  11. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    RE_

    Is the HDD present and/or recognized in the BIOS?

    Have you tried removing the battery and cord, pressing the power button for 1 minute, and then reinserting the cord and battery to attempt a restart?

    What happens if you tap F2 during the PC startup?

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  12. flo88 Posted messages 28494 Registration date   Status Contributor Last intervention   Ambassadeur 5 171
     
    The key must not be in GPT.

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  13. Donkev
     
    Thank you all for your help and attention. I finally resolved the issue by rebooting my USB key this time in GPT and it worked. I launched the installation of Windows normally and everything was going well until I hit a snag on the disk selection for installing the system. It wouldn't detect my hard drive and displayed the error message

    "We couldn't find any drives. To get a storage driver, click on Load Driver"

    In the end, I'm going through trials and tribulations with this installation, but I remain hopeful.
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  14. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
    No, it's not a virus; however, if it goes undetected and the PC is still under warranty, it's better to send it back to customer service.

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  15. quentin2121 Posted messages 9063 Registration date   Status Member Last intervention   Ambassadeur 1 313
     
    Take apart the HDD, put it in a 2.5 inch external case and test it with "crystaldiskinfo" on another PC!

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  16. MisteryBean Posted messages 8948 Registration date   Status Moderator Last intervention   1 292
     
     Disassemble the HDD, put it in a 2.5-inch external enclosure and test it with "crystaldiskinfo" on another PC!


    Bad idea 
     it's a new PC never opened


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  17. flo88 Posted messages 28494 Registration date   Status Contributor Last intervention   Ambassadeur 5 171
     
    Hypothesis:
    You switched your BIOS to UEFI, so it was in legacy before...
    Legacy = system disk (W10) in MBR
    UEFI = system disk in GPT, mandatory!
    And in some BIOS, the system disk becomes invisible when it is in MBR and the BIOS is in UEFI...
    So switch your BIOS back to legacy, run the HP factory restore tool, that way you will recover your PC to its original state.

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