This is it - for some reason you are trying to boot from a non existent partition/dev/sda5 doesnt exist drop to shell
I hope the solution is in either or both of these two wikis
http://www.linuxmint.com/wiki/index.php ... annot_boot
http://www.linuxmint.com/wiki/index.php ... _a_problem
Perhaps as simple as to boot the live CD and use Gparted to inspect your partitions and correct menu.lst
Open as root the Mint partition and edit /boot/grub/menu.lst so the lines in grub point to the right partition
It looks something like this
Note that grub starts counting from zero so (hd0,8) is the ninth partition of hard disk onetitle Linux Mint 6, kernel 2.6.27-7-generic
root (hd0,8)
kernel /boot/vmlinuz-2.6.27-7-generic root=/dev/sda9 ro quiet splash
initrd /boot/initrd.img-2.6.27-7-generic
Have to leave for work now