please some should help me, i was working with my hard drive perfectly well and i left the computer , before i came back my computer have gone to sleep when i put it on i could not find my hard drive in my computer and in disk management, i have changed data cable and it showed up in both my computer and disk management but with out a bar and its all greyed out, i checked the properties and it showing the capacity to be 0 byes. i have tried every possible solution i read online can someone please help. i have about 300 gig worth of back up and i cant afford to loose it