Have you tried reinstalling Grub?
Whenever grub doesn't seem to be working, try reinstalling it. When you make a major change to the disk structure, it is not uncommon to need to reinstall grub.
Look at the Grub Manual section on installing grub natively ( http://www.gnu.org/software/grub/man...-GRUB-natively
) and try reinstalling grub to the MBR. The results from the native grub “find” command often make it obvious why the system isn't booting.
Regarding Raid0, /boot cannot be in a Raid0. /boot needs to either be in a regular partition or in a Raid1, which looks like a regular partition to grub.