Press Ctrl+Alt+Del to restart
Reason - Mostly this problem occurred due to Hard Disk corrupted or Hard Disk cable problem
Solution and Recognize Problem - First of all assure that this problem is occurring exactly due to hard disk. You can insert your windows 7 OS and run this installation till "Install Window" if in this window your partitions are not showing than this is the hard disk problem and now you are assure this is hard disk problem now come to the solution
Kindly unplug all cable which connected to hard disk and plug it again in proper way. start your computer while starting your computer listen carefully if your hard disk is working fine then it will make little noise. if it is making noise than you are Done.
If you are still facing same problem than now its time to change your Hard disk.
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