MacBook pro stuck on start up, invalid node structure, diskos 1/0 error....

Question

Hello.
After downloading steam and a few games my laptop froze, I tried starting it up but it goes no further than the blue start up screen.
I looked at some forms and used '/sbin/fsck -fy' to resolve the problem, but it says invalid node structure, diskos2 1/0 error... I don't hear and unusuial sounds coming from the harddrive. Other people simply replace their hard drives but I need to retrieve some recent important files that I had not backed up,        Is there any possible way of getting back my files or even fixing this problem ? Help please !

Answer 1

You have two options:
Buy Alsoft's Disk Warrior that will repair the problem.
Reformat the hard drive.
Option 1 costs $100.00. Option 2 requires having a current backup you can restore, erasing the hard drive, then reinstalling OS X, and restoring your data from your backup. If you choose Option 2:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.