Originally Posted by kiran.ursal
actually i have already try in rescue mode. But even it not work
If I understand you correctly even the rescue disk is not allowing you to mount system partitions, can you post the output you get when trying to mount the partitions on the rescue disk?
If this is the case then it is possible your partition table may be corrupt or you HDD may be failing, try using the 'fsck' program on your HDD and report back what it says..
Hope this helps!