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Boot loop in BIOS after CPU change

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Alex5150 -  
 Dams -
Hi everyone,

I wanted to change my CPU from a RYZEN7 3800X to a RYZEN9 5900 (both using AM4 socket) on my MSI X570 A PRO motherboard.

The problem is that the PC always boots into the BIOS without wanting to boot from the hard drive where Windows is located.
I updated my BIOS thinking that would solve the problem, but it behaves the same... When I reset, I force the boot command and it doesn’t show any boot devices, but in the BIOS, it recognizes all my hard drives... I must admit I'm lost.

Has anyone had the same issue and how did they fix it?
Otherwise, do you have any hints to explore, please? I must admit that I’m VERY annoyed at the thought of having to reinstall everything... let's just say it’s not really the right time.

Thank you for your valuable help!

3 answers

  1. Alex5150
     
    Hello!

    Thank you for your response!
    Well, I finally found where the problem was coming from; if it can help someone else in trouble...
    In the BIOS, the CSM/UEFI option was set to UEFI, I switched it to CSM and it worked.
    I'm not really sure what that corresponds to, but it works, so the problem is solved!
    4
    1. Jeronimo02
       

      A big thank you, I was starting to lose all my hair over this problem.

      0
    2. Dams
       

      Hello,

      I had the same problem.

      I was stuck on the BIOS after installing the Ryzen 5 5500 processor.

      After switching to CSM, everything works again.

      Thank you very much!

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  2. Redbart Posted messages 20952 Registration date   Status Member Last intervention   3 382
     
    Hello
    unplug all NVMe disks, SSDs, HDDs and restart, then reconnect only the disk where Windows is installed, making sure it's set as the boot disk in the BIOS (unless that's the problem)

    --
    Mark as solved if your problem has been resolved. I use the informal 'tu' with everyone.
    Take the time to comment!
    A thank you is appreciated.
    0