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Disabled CSM prevents me from accessing my PC.

Wartog -  
fabul Posted messages 42163 Registration date   Status Moderator Last intervention   -
Hello,
here is my problem:
By trying something without knowing what I was doing, I disabled the CSM in my BIOS and since then, the computer starts, but nothing displays, it doesn't load or anything...
Before, it was enabled and set to Legacy, and when I set it to the available UEFI options, everything started, but once it got to the Windows display, it was stuck (but the computer had indeed booted as my RGB peripherals were launched by an application (Razer))

Well, since it wasn't working, I shut it down and re-accessed the BIOS, but due to a false maneuver, instead of switching it back to Legacy, CSM got disabled, and since then, no more PC...

No matter how many times I restart it, I can't access the BIOS or Windows, and I am sure the PC isn't booting because this time the RGB don't light up.

My motherboard is the Asrock A320M Pro 4

If you know how to regain access to the BIOS, I would be glad, thank you in advance :/

5 answers

  1.
    fabul Posted messages 42163 Registration date   Status Moderator Last intervention   6 066
     
    Hello,

    If you don't have access to the BIOS, perform a Clear CMOS to reset the values to default.

    Then boot in CSM mode (MBR)

    I will give you the instructions to convert your MBR to GPT and be able to set your BIOS to UEFI mode (Non-CSM).
    1
    1. Wartog74
       
      Re, I'm wartog just in case,
      So yes, my PC has restarted and everything is fine, I had forgotten the clear CMOS, but when you say that the disks need to be converted, the problem is that they are already in GPT as you mentioned, and having looked in disk management, it tells me that a GPT conversion is impossible, but to dynamic disk it is possible..

      Any solution/explanation for that?
      Thanks again.
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  2. Wartog74
     
    Um, I didn't say anything, my disk is indeed BMR after verification, but it's impossible to convert it to GPT.
    0
  3. epango Posted messages 37195 Registration date   Status Member Last intervention   Ambassadeur 4 270
     
    You say one thing and its opposite. Are your disks in MBR or GPT? If they're in GPT, there is no reason to convert from MBR to GPT.

    --
    Mistaking the names of things adds to the misery of the world (Albert Camus)
    0
    1. Wartog74
       
      No, my disks are indeed in MBR (I just checked incorrectly). And it's impossible to convert them because I have files on them (it's not a problem, I can delete them, I have a way to back them up..)

      The problem is that I don't know how to transform my disk where the system is located...
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  6. fabul Posted messages 42163 Registration date   Status Moderator Last intervention   6 066
     
    You start in recovery mode to launch the command prompt

    (Go to Settings > Updates and Security > Recovery > Restart now...)

    When you have the command prompt, you run the two commands one after the other

    mbr2gpt /validate

    mbr2gpt /convert

    Then you will only be able to boot in UEFI mode, no longer in CSM mode.
    0