by usbtux on Mon Dec 03, 2012 4:09 pm
Reinstall grub with following steps
boot and run from Linux Live DVD/CD
from a terminal sudo os-prober, and look for the mint partition this should be the / partition (root)
mount it with sudo mount /dev/sdaX /mnt, replace X with actual root partition of your selection
reinstall grub with sudo grub-install --root-directory=/mnt /dev/sda
nb sda may be different on yours.