How to repair the grub on debian

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http://unix.stackexchange.com – I am loading Linux (Debian Lenny) on VirtualBox but there is apparently something wrong with the GRUB. When I start the system, a grub menu appears: Then I run the following commands: root (hd0,0) kernel /vmlinuz root=/dev/hda1 ro quiet initrd /initrd.img boot After the system boots, how should I continue to repair the grub file? Any advice would be appreciated! (HowTos)