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Fixing a grub rescue prompt on Centos 7 after Windows 10 upgrade
06/10/16
Evidently sometimes Windows 10 will add a partition when upgrading which means grub can't find it's config file.
To fix this you can boot using the Centos 7 install DVD into rescue mode. You need to choose the boot option that matches whatever version of Centos you installed, either legacy boot or EFI,
chroot /mnt/sysimage
(for legacy boot)
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda (replace the a with whatever drive is your boot drive)
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