I made a Ghost image of a Puppy Installation. When I restored it on a different hard-disk system freezed with the message "GRUB..."
What has it happened?

Grub's "root" (where to look for the /boot/grub/ directories and its files) has changed when you played with different disks; you need to interrupt Grub at the 'first stage' and specify a working 'root'.

How can I do it? Maybe editing file menu.lst?

For doing that, I have to know the path, in other words how the drive has been mounted...

Thank you.

We need to know more, how many distros do you have and the hd partitions. Give us your partitions by doing 'fdisk -ls' in terminal as root and pasting the results here.

First let me ask, do you have a linux operating system that will boot on this computer? You will need something, if not need to have a live cd, about any live cd will work.

Just one distro, the last Puppy
Two partitions: hda1, hda2

and this is the menu.lst file:

# GRUB configuration file '/boot/grub/menu.lst'.
# generated by 'grubconfig'. Mon Jun 9 11:09:18 2008
#
# The backup copy of the MBR for drive '/dev/hdc' is
# here '/boot/grub/mbr.hdc.19703'. You can restore it like this.
# dd if=/boot/grub/mbr.hdc.19703 of=/dev/hdc bs=512 count=1
#
# Start GRUB global section
default 0
timeout 3
color light-gray/blue black/light-gray
# End GRUB global section
# Linux bootable partition config begins
title Linux (on /dev/hdc2)
root (hd0,1)
kernel /boot/vmlinuz root=/dev/hdc2 ro vga=787
# Linux bootable partition config ends
title Install GRUB to floppy disk (on /dev/fd0)
pause Insert a formatted floppy disk and press enter.
root (hd0,1)
setup (fd0)
pause Press enter to continue.
title Install GRUB to Linux partition (on /dev/hdc2)
root (hd0,1)
setup (hd0,1)
pause Press enter to continue.
title - For help press 'c', then type: 'help'
root (hd0)
title - For usage examples, type: 'cat /boot/grub/usage.txt'
root (hd0)

Ok, I solved reinstalling Grub from the puppy live cd :-)