You will need to do a system repair with your recovery or operating system disc. If the repair won't take, the reformat the hard drive and install a new operating system. If the hard drive will not format, or you have any issues during or after the install, then the hard drive has failed and will need replaced.
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You will need to do a system repair with your recovery or operating system disc. If the repair won't take, the reformat the hard drive and install a new operating system. If the hard drive will not format, or you have any issues during or after the install, then the hard drive has failed and will need replaced.