I tried ubuntu, but decided to switch back to Windows. I used the HP Recovery discs and restored to factory settings and installation went smoothly. After it was finally finished and about to boot, it shut off. After several attempts at this, it eventually began checking C: (NTFS). CHKDSK passed the first stage but again, the computer shut off at stage 2, "verifying indexes." f I try to skip CHKDSK, the computer simply shuts off immediately after. Is my harddrive bad? Any help would be appreciated