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I had problems with grub after my installation + my hard drive was not showing up in the devices list when i chose a device to boot (not from setup but before startup). I have tried several methods to restore my grub like this one:

sudo os-prober

sudo mount /dev/sda2 /mnt (my mint installation)

sudo chroot /mnt

sudo grub-install --root-directory=/mnt /dev/sda

I have ran in to this error:

Path '/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.

Have tried several things on forums but none seem to work, any ideas? thx

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Are you saying that your BIOS cannot see your hard drive during POST? (en.wikipedia.org/wiki/Power-on_self-test) If that's the case, then I suspect hardware failure. If your BIOS can see your hard drive, but grub cannot, then I recommend booting from a live CD to repair or reinstall. –  Nate from Kalamazoo Jun 17 '13 at 12:37
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