messed with grub2 in grub costomization

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http://forums.fedoraforum.org – I accidentally deleted every thing from grub2 customizer including command line everything now i cannot boot in fedora 17 please help i can only boot into recovery mode and tried following chroot /mnt/sysimage grub2-install /dev/sda grub2-mkconfig -o /boot/grub2/grub.cfg but still nothing happens i had also attached where i get stuck in boot kindly tell me how to completely unistall and reinstall grub2 Attached Thumbnails   (HowTos)