GRUB Rescue Command Problem

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http://askubuntu.com – I did originally have Ubuntu installed on my Laptop, however I then installed Joli OS, since I did not want it any more, I formatted the disk which had Joli OS on, thinking that it would revert back to the original Ubuntu boot loader. However when I boot my laptop, it comes up with: GRUB Rescue > Any ideas? Many thanks (HowTos)