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This is usually fixed by running the scripts detect the installed operating systems and generate the boot loader's (grub2 in this case) configuration file. On CentOS 7, that should be grub2-mkconfig. Check that windows is detected. Run grub2-mkconfig but discard its output: $ sudo grub2-mkconfig > /dev/null Generating grub configuration file ... Found ...


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The issue I was having was caused by a windows installation without a boot loader. When attempting to fix this using Windows Recovery, the Windows installation could not be found because I had a separate hard drive with a Linux installation running in the system. When I unplugged this Linux HDD leaving just the windows HDD plugged in, the recovery could ...


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The new motherboard runs UEFI, while the old one had BIOS. Hence I needed to install grub-efi instead of grub-pc.


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If I understand you you're looking for a way to boot from USB using grub. According to this post, the way to do that is to start the machine with the USB stick connected and get to the grub prompt. There you can type root (hd (without pressing enter) and press tab to list hard drives. The USB device will probably be hd1 so the line would be root (hd1). From ...


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Making a bootable USB with Arch (Live), mounting everything, going into arch-chroot, then removing xf86-video-intel did the trick.


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I posted a patch to the two bugzilla.redhat.com bugs that actually fixes this issue. maxschlepzig's patch is very close to the right answer, but not quite. My patch is based on his.


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Have a look here This will update the grub properly see this might help you out



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