2) Open a Terminal and type in the following commands, note that hd0,0 implies the first hard drive and the first partition on that drive, which is where you probably installed grub to during installation. If not, then adjust accordingly.
sudo grub
> root (hd0,0)
> setup (hd0)
> exit
Reboot (removing the livecd), and your boot menu should be back.
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source:http://linuxpoison.blogspot.com/2008/06/135781758013245.html