Remember that your BIOS settings will be reset with a new mainboard. This includes secure boot settings, so for example if you disabled secure boot to install a particular Linux distro, you will need to disable that setting again to successfully boot!
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Remember that your BIOS settings will be reset with a new mainboard. This includes secure boot settings, so for example if you disabled secure boot to install a particular Linux distro, you will need to disable that setting again to successfully boot!