Did you assign the correct device names as boot drive?
Boot back with the live cd. Find the drive first with lsblk /dev/DRIVENAME usually sda or sdb. mount the drive and your home.
Change root back to your /mnt (the original installation) with chroot.
Now make sure you set the boot device to the correct drive with
Code:
grub-install --recheck /dev/DRIVENAME
And copy the grub.mo and continue as before.
I hope this helps!