Grub "error 2"

[Guillaume Gadbois Gervais]

after the instalation there was a GRUB prompt so i went into the rescue 
mode.

i did these steps...

To restore Grub
1) Boot from the first CD
2) Type: linux rescue
3) select: skip media test
4) select: of for language
5) select: ok for keyboard
6) select: continue with rescue
7) select: ok with rescue
8) type: chroot /mnt/sysimage
9) type: grub-install /dev/sda

command line grub-install /dev/sda (cause i have serial ata in raid 0).
After i restarted my computer and i got

"GRUB Loading stage1.5.

GRUB loading, please wait...

Error 2"

someone know why??

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