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I am getting this grub rescue error no filesystem thing. I have read a lot of threads on this issue, but those solutions are not working. I tried live CD, and changed the booting option from hard disk to CD ROM, but still I get the same grub rescue error.

I have two operating systems, the other one is Windows 7. I formatted some part of my hard drive during which GRUB might have lost some files. I get that, but now what should I do? Please tell me how to deal with this thing:

Error: unknown filesystem.
grub rescue>
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marked as duplicate by jokerdino Sep 2 '13 at 15:02

This question was marked as an exact duplicate of an existing question.

    
If you believe you have done as you mentioned in the above question then you will have to use either CD or USB to recover your OS. – Tarun Aug 21 '13 at 6:53

Did you try below link..

https://help.ubuntu.com/community/Boot-Repair

or can you provide more information regarding your GRUB ... some snapshoot...

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