Hi,
I had the same sort of issue. My workstation with a Asrock motherboard
suddenly decided to reset UEFI to defaults which caused my Fedora
installation not to boot. I could boot with a Live USB stick and use
efibootmgr to set the UEFI boot for Fedora but next time I powered on my
machine the same issue happened (I remove AC power from my workstation
when it is not in use). Turned out to be a flat battery for the BIOS
(coin cell). I replaced the coin cell and set the UEFI boot with the
Live USB stick and all was well.
The efibootmgr command was something like :
efibootmgr -c --part 2 --loader /EFI/Fedora/grubx64.efi --label Fedora
Please check the manpage of efibootmgr, the process of how to setup the
UEFI boot is described very well.
Regards,
Michel
On 2018-11-21 05:00, Steven Tardy wrote:
On Tue, Nov 20, 2018 at 7:40 AM lejeczek via CentOS <centos@centos.org>
wrote:
hi guys
I have a box on which UEFI boot has gone haywire and instead
of boot it power the box down, that is before even going to
grub2. (displays some error message)
I if change to BIOS boot then I can start Centos' rescue -
my question is: how can I rescue, re-build grub so it would
boot from tradition BIOS?
If the OS was installed with UEFI enabled I would go back to UEFI mode.
Then re-add your OS boot configuration within the BIOS setup screen.
Most motherboard manufacturers detail this process on their website
where
you browse the disk to select somefilename.efi and give it a label
“CentOS”.
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