Hi I encounter this problem before. one of those 2.5 hdd. The only way to resolve this is to install the recovery cd and thru format the HDD. I know you will lose all your file. So far that is the solution I can provide you. Until now I am looking for a way to resolve this problem with out losing any file and still restore the hard drive. I hope this will help you to restart your laptop and without spending or buying a new hard drive.