9 Replies Latest reply: Sep 8, 2011 1:21 PM by robertfrombath
robertfrombath Level 1 Level 1 (0 points)

HELP....!  just trying to reload mac os x on my imac, and now the screen has froze and will do nothing{blank screen with a apple}. how do i reboot it.

  • Kappy Level 10 Level 10 (257,985 points)

    It would help to know what version of OS X you are trying to reinstall.

     

    Press and hold down the Power button for about 5-10 seconds which will shutdown the computer. Then see:

     

    Reinstall Snow Leopard without erasing the drive

     

    Do the following:

     

    1. Repair the Hard Drive and Permissions

     

    Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. 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 installer.

     

    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

     

    2. Reinstall Snow Leopard

     

    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.

     

    Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

     

     

    Reinstalling 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. Alterhatively, 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: Select Reinstall Lion and click on the Continue button.

     

    Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.


  • robertfrombath Level 1 Level 1 (0 points)

    i belive the latest version, problem started after recent update. i purchased teach yourself visually imac, the last resort was to reinstall snow leopard, followed the book, and now its gone tits up on a large scale and wont do nothing

  • Kappy Level 10 Level 10 (257,985 points)

    You can try the reinstallation process for Snow Leopard if that's what you currently have installed, but not knowing what version is installed makes it difficult to suggest what you need to try first.

     

    Alternatively, you can simply erase the drive and start over with either Snow Leopard or Lion (if you have a Lion installer.) This may not be feasible if you have files you wish to recover first.

     

    So give me the layout, and I'll try to give you some suggestions.

  • robertfrombath Level 1 Level 1 (0 points)

    im not quite sure what version i have installed, all i know is i put snow leopard in the optical drive and started the process of reinstalling. but the screen has now froze {off white with apple logo} will not respond to anything, plus the disc is still in the drive.

  • robertfrombath Level 1 Level 1 (0 points)

    forgot to mention, i done a  backup before i started, so i dont mind restarting a complete reinstall if that is what is needed

  • Kappy Level 10 Level 10 (257,985 points)

    Hmmm. OK. I would shutdown the computer. Restart and after the chime press and hold down the "C" key to force the startup from the installer DVD. Release the key when you see the spinning gear below the dark gray Apple logo. See if that gets you started. Note that booting from the DVD takes some time. It could be 5 or 10 minutes before the startup is completed so have some patience.

     

    If you are able to startup then i suggest using Disk Utility to repair the drive and permissions then reinstall Snow Leopard.

  • robertfrombath Level 1 Level 1 (0 points)

    sorry to bother you again Kappy,tried a restart and i cant even get the chime you and the book say about.

  • Kappy Level 10 Level 10 (257,985 points)

    That's not good. No chime usually indicates a hardware failure. You may want to take that puppy in to an Apple service location. Your hard drive may have failed or you may have some other hardware failure.

  • robertfrombath Level 1 Level 1 (0 points)

    thankyou for the time and effort for trying to help this mac novice,but a trip to the apple shop tomorrow now seems the obvious option,thanks again. Rob