(Debian) tells GRUB the location of the kernel /set the location of the root filesystem
Budget: €30 – €250 EUR
sdaX is missing, How to go
grub> set root=(hd4,2)
grub> linux /boot/vmlinuz-3.13.0-29-generic root=/dev/sdaX
grub> initrd /boot/initrd.img-3.13.0-29-generic
grub> boot
grub> set root=(hd4,2)
grub> linux /boot/vmlinuz-3.13.0-29-generic root=/dev/sdaX
grub> initrd /boot/initrd.img-3.13.0-29-generic
grub> boot