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When I try to boot I get this message: error: unknown filesystem. Entering rescue mode... grub rescue>

results of: grub rescue> ls

Is as follows:

(hd0) (hd0,msdos1)

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Can you post the output you get when you run root '(hd0,msdos1)' and ls /? – jkt123 Apr 21 '14 at 2:37
It shows Unknown command – user271736 Apr 21 '14 at 2:49

you might have lost grub (the boot loader) /or may be the boot record have been changed without running the update command . you can try recovering grub with a live medium example with using a ubuntu cd/dvd in live mode ...please go through this post : how to recover grub with a live media ubuntu/mint live usb/cd/dvd

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