I had turned off the system and then when i turn on my system (having UBUNTU 14.04 OS and no any dual boot), i am getting the following error as:-error: no such partition.Entering rescue mode...grub rescue> So how can i overcome this error..?? i tried ls and got only (hd0), but didn't get any (hd0,msdos5) or (hd0,msdos6) etc.,  And how can i retrieve the data from the system (I tried inserting the Ubuntu 14.04 cd --> try Ubuntu, and got Ubuntu 14.04, but i am not able to see any files/folders which i wanted to retrieve... ). Are there any other ways such that i can retrieve the data from the so crashed system..?? 
Regarding Retrieving data from crashed Ubuntu 14.04 OS
grub;data;rescue