3 Replies Latest reply: Aug 12, 2012 12:33 PM by Kappy
greg0208 Level 1 Level 1 (0 points)

My iMac came with OS 10.6.2 installed and the 10.6.2 DVD. I've been updating on a regular basis. Recently some unexplained crashes requiring a complete restart. Just ran the Apple Hardware Test (both short and extended). No hardware problems. So I'd like to reinstall my system software. But of course the DVD version will not work. Any suggestions on how I can reinstall to 10.7.3. I'm not ready to move to Mountain Lion yet.

iMac, Mac OS X (10.7.3)
  • Kappy Level 10 Level 10 (252,495 points)

    Reinstalling Lion/Mountain Lion Without Erasing the 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.


    Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.


    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.


    Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.


    Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.


    You could reinstall Snow Leopard if you preferred, but that will require erasing the drive first.

  • greg0208 Level 1 Level 1 (0 points)

    The perfect answer. I appreciate it very much. Things seem to be running much faster than before.


    It took a long time. I have a VERY slow DSL connection. When I started the install it said it would take 101 hours. It was down to 13 hours when I finally went to bed. Not sure what time it finished.


    For some reason Restore installed Safari 5.1.6. Of course that would not launch on 10.7.4. Not sure why Software Update didn't update that. Had to restart from my backup drive, unlock Safari on my internal drive, change all permissions, delete and then copy Safari 6.0 from my backup drive. It's working now.


    Thank you again.

  • Kappy Level 10 Level 10 (252,495 points)

    Glad I could help.