There are quite a few new users on the ask.fedoraproject.org website which get confused when the try to fix their grub2. New users often want to dual-boot with windows (understandably) but the windows installer is not so nice, and it removes grub from the mbr/gpt. Therefore, these users often find them selves in the situation that they need to reinstall grub, and reconfigure grub such that it now recognizes the newly installed OS. The install-media have a nice rescue mode, which is nicely documented in the manual (see, http://docs.fedoraproject.org/en-US/Fedora/19/html/Installation_Guide/ch-Boot-x86.html#sn-boot-menu-x86). And after booting in rescue mode a user can perform: chroot /mnt/sysimage grub2-install /dev/sda grub2-mkconfig -o /boot/grub2/grub.cfg However, many users install fedora with the liveCD, which does not have this rescue boot feature. And i'm puzzled to why? Request: Add the rescue boot option to the liveCD's
See https://bugzilla.redhat.com/show_bug.cgi?id=1256061
*** This bug has been marked as a duplicate of bug 1176580 ***