How do I know if I have a bad hard drive?
You will need to bring your laptop into support central to have a diagnostic test run on your computer. If the hard drive tests bad and there is no accidental physical damage to the laptop, we can replace your hard drive for free. If the hard drive tests bad, it may take several days (and sometimes more) for us to try to recover files from your broken hard drive.
Please visit our answer about moving your laptop while it is turned on to avoid damaging your hard drive.