Hi, I tried both options: boot with rescue CD and Single User option also.
First option with rescue CD failed when I tried mount /dev/sd* with command:
mount -o remount,rw /dev/sdb2 /mnt/
error message is:
mount: /mnt not mounted or bad option
IfI use ls /dev/sd* I can see:
/dev/sda /dev/sda2 /dev/sdb /dev/sdb2
/dev/sda1 /dev/sda3 /dev/sdb1 /dev/sdb3
No /dev/hda* is presented.
Second option using the Single User mode failed because there is a password locked GRUB. I don't know this password. The only option I can see in the GRUB boot menu is to enter a password for more options.