From what you say I understand that you can now access the debian share(s). Try this: open a shell and as root type (or do sudo...)
Quote:
chroot /path/to/debian/root-directory
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Just oin case you have a separate /boot partition do
Quote:
unmount /boot
mount /boot
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to make sure the right /boot partition is mounted.
Then reinstall grub with the command
provided you want to install it to the MBR of your first HDD
Now try to boot normally. Hope that solves it!