Upgrading from Leopard to Lion

Discussion in 'macOS' started by omnom123, Oct 3, 2011.

  1. omnom123 macrumors newbie


    Apr 7, 2011
    I got a iMac with Leopard and I would like to upgrade to Lion. I have a retail copy of Snow Leopard so as to install them first.
    When I open the DVD it shows the Installer and some other folders.

    I open the Installer and then it shows an error:
    "Mac OS X Snow Leopard cannot be installed on this Computer"

    I open the folder with the instructions and I find the hardware requirements. I check the "About this Mac" and everything seems to be OK.

    4gb Ram (Snow Leopard needs 1gb)
    146gb Free Space
    Intel Processor etc...

    I tried to boot to the DVD by pressing the C button when starting and it shows the same message again. :confused:

    What should I do?


    Any help would be appreciated!
  2. wrldwzrd89 macrumors G5


    Jun 6, 2003
    Solon, OH
    First thing to check when these sorts of issues occur is the installer log, if you can get to it. If the installer doesn't even get that far, then check the status of your disk with Disk Utility (click Verify Disk). If it reports problems, have Disk Utility attempt to repair them.
  3. omnom123 thread starter macrumors newbie


    Apr 7, 2011
    I don't think it creates any log... I will try to verify the disk but how can it get a problem as it is the main system's HDD?
  4. bobotech macrumors newbie

    Sep 29, 2011
    First thing, make sure you backup ALL your user created data worth saving and have your existing app installers handy.

    Dumb question but the picture of the big cat on the dvd itself is the white Leopard, right? Just want to make sure you aren't attempting to use a burned dvd with a possibly incorrect version of the OS on it.

    Usually that error is caused by someone using the grey OEM dvd that comes with a new computer rather than the retail DVD which has the picture of the big cat on it.

    If you are using a burned dvd, then its possible that the version you have is the non-retail and just literally can't be used on your computer.

    Now if everything I said above is a non-issue/dumb/whatever, restart the mac to the retail SL dvd and when you get to the installer, click on Utilities at the top and choose Disk Utility and then highlight your drive, and then click on the Partition tab and recreate a new partition and then you should be able to install SL. It just might be something funky with your current hard drive format for whatever reason. What you would be doing is deleting your existing drive and recreating it from scratch.

    When you are done, just restore your backed up user created data and reinstall your apps and you should be good to go.
  5. Gregg2 macrumors 603

    May 22, 2008
    Milwaukee, WI
    From what I've seen those two statements are incompatible. That message is what you get when using a disc that is not a retail version. ("Retail copy" is an oxymoron. In theory, every one that Apple produced was an original, even though they pressed thousands of them.)
  6. omnom123 thread starter macrumors newbie


    Apr 7, 2011
    That might be the problem.... I tried to installed Snow Leopard from the DVD came with my Macbook....

    Ok.... Thanks for your help....
  7. maflynn Moderator


    Staff Member

    May 3, 2009
    Apple keys the system disks to the type/model that it came with, so if you tried to use a MacPro Snow Leopard disk on a MacBook Pro it won't work, or as in your case. You'll need to purchase Snow Leopard. You could also buy Lion in a thumb drive from apple and skip SL all together. I don't think there's an upgrade path so it would possibly require a clean install,i.e., formatting your drive. I'm not entirely sure about that however
  8. bobotech macrumors newbie

    Sep 29, 2011
    For future reference, the "retail" dvd is ONLY the one that you could buy at the Apple store or other software retailer. It is not the ones that come with new macs, as stated above, those are tied to specific families of machines. Macbook pro grey dvd could only be used to install the OS on certain Macbook Pros.
  9. iWind130290 macrumors member

    Aug 30, 2011
    Ha Noi, Viet Nam
    Your problem is version of the retail CD Snow Leopard is not suit for your iMac. So you should go this way:
    I see that you've 1 Macbook Pro and 1 iMac. And make sure that you also have Lion Installer because the title of this thread. Pick up an USB then create a bootable USB with the Lion Installer by your Macbook Pro. Then boot from the USB to do a clean install Lion on your iMac. It must work as well. If somethings' wrong. Post your next question here and I will help you.

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