Fix grub

• Boot from live dvd OR choose RESCUE from boot USB (graphical desktop is ok)
• use gparted to find boot partition
• mount /dev/sdX /mnt

mount /dev/sda5 /mnt

• mount –-bind /dev /mnt/dev
• mount –-bind /proc /mnt/proc
• mount –-bind /sys /mnt/sys
• chroot /mnt
• grub2-mkconfig -o /boot/grub2/grub.cfg
• grub2-install /dev/sda
• chtrl-d 'exit'
• reboot

grub edit

F2 into grub CLI

insmod ntldr

insmod ntfs

insmod chain

set root=(hd0,msdos1)

chainloader +1

boot