Is it possible to downgrade an iMac (model no. a1311) that originally shipped with Lion to Snow Leopard-?

Is it possible to downgrade an iMac (model no. a1311) that originally shipped with Lion to Snow Leopard…?

Maybe:
https://discussions.apple.com/message/16247806#16247806
If you find Snow Leopard is really required, you may find getting a used or refurbished Mac that shipped new before July 20, 2011 is preferable*:
http://www.macmaps.com/usedrefurbished.html

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  • How can I downgrade from Lion to Snow Leopard?

    Hello.
    Yesterday, I upgraded my Mac to Mac OS X (10.7 Lion) from 10.6.8 Snow Leopard. However, I wish to downgrade.
    Obviously, I would like to not lose any data at all. However, I have never downgraded before.
    I still have the Snow Leopard installation disk that came with my Mac.
    How should I do this? I was thinking it would be easiest to simply head on over to an Apple Store...
    I did some research (aka Googling), and I read up on the subject quite a bit.
    If I simply put in the disk, will I be able to downgrade from Lion to Snow Leopard as easily as the upgrade was?
    Also, I have heard about holding down the "C" button to do this... how exactly?
    I have never backed up my Mac, nor used Time Machine.
    Also, is it possible to install Snow Leopard on a separate disk, and set it up so that I can switch between them on command?
    Will all of my preferences be saved, or does this wipe everything, not just the system and libraries folders?
    I realize that I have a lot of questions, and therefore I appreciate everyone's help in advance. Thanks again.
    Sincerely, Zach

    Backup your files.
    Booting From An OS X Installer Disc
    1. Insert Snow Leopard Installer Disc into the optical drive.
    2. Restart the computer.
    3. Immediately after the chime press and hold down the "C" key.
    4. Release the key when the spinning gear below the dark gray Apple logo appears.
    5. Wait for installer to finish loading.
    Erase Drive
    1.  Boot from your OS X 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.
    2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
    3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
    4. Upon completion quit DU and return to installer. Install Snow Leopard. Restore your files after the installation has completed.

  • Trying to update iMac G5 with OS X Snow Leopard and unable due to no Intel proccesor. Are all new upgrades going to be unavailable? What is the last available upgrade?

    I'm trying to update my parent's iMac G5 with OS X Snow Leopard and unable to do so because it doesn't have an Intel processor. Are all new upgrades going to be unavailable? What is the last available upgrade? Is it possible to get an Intel processor installed?
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    Actually you can upgrade to snow leopard.  I have an iMac G4 and upgraded to snow leopard by installing it using an external DVD RW drive.  It was complicated but it worked.  I ended up going back to using tiger though.  I liked it better the simple old school way.

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    Your iMac needs to be a mid-2007 or newer model. See this page for specs supported, and assuming you meet them, you can upgrade from Snow Leopard to Mountain Lion (see step 2 on the linked page).

  • My iMac is connected to a Brother printer. I have Snow Leopard 10.7.3 As of yesterday, when I try to print a PDF it prints as a blank black page. Does anyone know how to correct this so that the PDF will print as I see it on screen?

    My iMac is connected to a Brother printer. I have Snow Leopard 10.7.3 As of yesterday, when I try to print a PDF it prints as a blank black page. Does anyone know how to correct this so that the PDF will print as I see it on screen?

    If you are running Mac OS X 10.7.3 then you have Lion installed, not Snow Leopard. It's probably not important to this discussion, but something you should be aware of.
    What application are you printing the PDF files from? Have you tried opening the PDF file using the Preview application that can be found in the Applications folder? Does the issue still occur? Have you tried other PDF files from a different source?
    Another poster in the following discussion thread reported that this method resolved their black blank PDF issue when viewing (and presumably printing) PDF files from Safari.
    https://discussions.apple.com/thread/3890509?start=0&tstart=0
    This solved my question by mcbuffy  on Apr 20, 2012 11:29 AM 
    There's a solution if you want to see the PDF inside Safari's window :
    Go to the folder : Your Hard Drive / Library / Internet Plug-ins.
    If you see a file with PDF in its name drag it to the trash.
    Quit and restart Safari to test with a PDF.
    If it works you can empty the trash.

  • My new iMac is not shipping with Lion installed. Will I be able to do a Migration from my PC to my iMac without installing Lion first?

    My new iMac is not shipping with Lion installed. Will I be able to do a Migration from my PC to my new iMac? I only want to transfer photos and my music, currently on my PC (and on my iPod Touch & iPad).
    Can anyone give me a list of steps to follow or let me know if Migration Assistant is available prior to Lion for PC to Mac?
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    -SweetDee

    SweetDee,
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  • Successful downgrade from Lion to Snow Leopard?

    I will get to my question at the end, but first I must explain the situation:
    I have an MBP Intel Core 2 Duo, circa 2006.
    The case was falling apart so I bought a new MBP Intel Core i7, September 2011 model.
    The new MBP came with Lion, which to my horror did not support PPC applications.  I know some of the Mac OS hobbyists will say 'get over it'.  However, I use Macs professionally and since I want to eat (so to speak), I must work, and to work efficiently I need Rosetta because there is quite simply no replacements available for some of my quirky software.
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    Boot lion and use the disk utility to create a new partition:  I took 400 GB for the new SL partition and left Lion with 100 GB.  Lion is pretty neat in allowing you to repartition on the fly.
    Do the latest software update on the old computer (10.6.8).  Restart new computer in target disk mode and connect to old computer using a firewire.  On the old computer boot up Carbon Copy Cloner (freeware).  Set the old computer as source and the SL partition as traget on the new computer.  Simply accept all the default settings on CCC and let it to Clone (ie. backup) the source onto the target.  CCC will generate an exact copy of the contents of the old computer's hard drive on the SL partition on the new machine.  I believe it will aslo transfer FileVault protected accounts even if the user is not logged in.
    Shut down new computer.  Reboot holding down the optino key.  For some reason the new SL partition was named IEF Drive (or something similar, I cant remember because it reverted back to its original name after a restart).  The machine will boot into SL.  Go to system preferences and select SL partion as your startup disk.  All done in about 4 hours, most of which is waiting for CCC to finish!  Whoopeeee.
    So far it seems to me like EVERYTHING works just fine.  I was particularly suprized that the Thunderbolt port was able to drive my external display either via vga or hdmi adaptors.  I half expected that not to work because it is a brand new feature.  Of course, it may not work with a Thunderbolt display. Howerer, since the machine is duel boot and I can go to Lion any time I feel like it.
    I did have to reinstally Application Enhancer so that my Unsanity Haxies would work, but you have to do that after any migration.
    Performance
    Geekbench 32 bit overall score:   lion, 8473:  SL, 8321
    Novabench:  lion, 882:  SL  859
    At first I had the impression that Lion was a bit swifter on start up and GUI response, so I used migration assistant to migrate my old computer user account onto the Lion partition.  As expected all the login items and extra system services that came across from the old machine had a penalty for start up and shut down.  After timing both I find that SL is slightly faster up and down than Lion.  Even so, I am sorry not to be able to use Lion as I liked the look and feel of it right from the get go.
    Never mind ...its function over form for me every time
    Now my question is to ask whether others have exposed any weaknesses in a SL down/upgrade?  It would help if you would post here so that I can head off any problems before I discover them in a critical situation. 
    Also, do the experts think SL will match the 64 bit performance of Lion, which I was unable to test because I am too mean to pay the 19 bucks for Geekbench?
    Finally, I must say that after many years of daily use on countelss machines CCC has never once let me down, unlike TimeMachine.

    I had said that the "function" of the user preferences in the ByHost folder won't be preserved on a different computer, not that the files wouldn't be there!
    The ByHost folder contents are accurately preserved in a CCC clone, but the .plist files themselves are tagged with the "hardware UUID" of the particular computer they were made on, and will only function on that computer. Peek inside at the names of these preference files and you'll see.  It's not an important issue in practice.
    From Mike Bombich's CCC Knowledge Base, here:
    Can I back up one computer and use the clone to restore another computer?
    As long as the architectures match (e.g. intel vs. ppc), then the answer is **probably yes**. However, there are two caveats.
        Some of your preferences on Mac OS X are considered "host-specific." Preferences such as these will be ignored if you boot your cloned operating system and data from another machine. For example, the screen saver preferences are host-specific -- if you boot another machine from your bootable clone and the screen saver kicks in, you will notice that it has reverted to default settings. Do not fear that you have lost any data, your original preferences will be "restored" when you boot again from your original computer. To learn exactly what preferences are host-specific, navigate in the Finder to your home directory, then to Library/Preferences/ByHost.
        Don't install older versions of Mac OS than what comes with your computer. When you get a brand new Mac from Apple, it usually has a specific version of Mac OS X installed on it, and further, a specific "build" number. If you install an older version or build of the OS, for example by cloning your older Mac to it, then it may behave unexpectedly. When migrating your old Mac to your new Mac, be sure that your old Mac has been updated to at least one later release than what came on the new Mac. For example, if your new Mac came with 10.4.7, update your old Mac to 10.4.8 before migrating. If such an update is not available, use the Migration Assistant instead.

  • Is it possible to install Lion on the second hard disk on my Mini (2010) Snow Leopard Server, and switch between Lion and Snow Leopard? I like those voices Lion has in speech.

    Is it possible to install Lion on the second hard disk on my Mini (2010) Snow Leopard Server, and switch between Lion and Snow Leopard? I like those voices Lion has in speech.

    When baltwosaid NO emphatically, that was described as CORRECT ANSWER. Ditto in the caeses of the radically different answers from  Camelotand Matt Clifton
    Could it be that CORRECT ANSWER needs better defining by Apple?
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  • My iMac says I have 10.6.8 operating system now. Problem is I do not know if that is 'Lion' or 'Snow Leopard' ... and I wish to upgrade to 'Mountain Lion'

    My iMac says I have 10.6.8 operating system now. Problem is I do not know if that is 'Lion' or 'Snow Leopard' ... and I wish to upgrade to 'Mountain Lion'

    That is Snow Leopard.
    Upgrading to Snow Leopard, Lion, or Mountain Lion
    Upgrading to Snow Leopard
    You can purchase Snow Leopard by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The price is $19.99 plus tax. You will receive physical media - DVD - by mail.
    Third-party sources for Snow Leopard are:
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    Snow Leopard from eBay
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    Be sure your computer meets the minimum requirements:
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    Macs that can be upgraded to OS X Mountain Lion
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      3. MacBook Pro (Mid/Late 2007 or newer)
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      5. Mac mini (Early 2009 or newer)
      6. Mac Pro (Early 2008 or newer)
      7. Xserve (Early 2009)
    Are my applications compatible?
    See App Compatibility Table - RoaringApps - App compatibility and feature support for OS X & iOS.
    Am I eligible for the free upgrade?
    See Apple - Free OS X Mountain Lion upgrade Program.
    For a complete How-To introduction from Apple see Apple - Upgrade your Mac to OS X Mountain Lion.

  • Can't find photos after downgrading from Mountain Lion to Snow Leopard

    I downgraded from Lion to Snow Leopard as my comuter was really slow (probably right at the min requirements for the new OS)
    I can't locate my photos from my Time Machine. How do I access these? I have reinstalled everything back to Lion to try to get them off my Time Machine as it currently won't let me go back in time past the date when I down graded to Snow Leopard..
    I am a dead man if I don't find the photos of our kids....

    A good ressource for Time Machine questions is Pondini's Time Machine - Troubleshooting
    Have a look at the section Time Machine - Troubleshooting E2. I can't see some backups
    as it currently won't let me go back in time past the date when I down graded to Snow Leopard..
    You probably now have two different Time Machine backups - after the downgrade TM started a new one. Have you inspected your backup disk in the Finder and looked what backups are there?
    You should see a folder "Backups.backup.db" and inside the current backups for the computers you are syncing. Is there more than one? Open the folders and look at the dates. Is there any backup from last year?
    Regards
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  • Is it possible to make a reflection of an image that will change with the image? [was: Reflection]

    Is it possible to make a reflection of an image that will change with the image?

    normfb wrote:
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    Nice one Norm.  Five Kudos points to you.

  • Upgraded my macbook pro to mountain lion from snow leopard does this mean i can upgrade my imac as well for the same price? And will it mess it up?

    upgraded my macbook pro to mountain lion from snow leopard does this mean i can upgrade my imac as well for the same price? And will it mess it up?

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  • I recently Downgraded from Lion to Snow Leopard 10.6. How do I update to 10.6.2 or beyond?

    This is the problem... How do I fix that?

    app61 wrote:
    I recently Downgraded from Lion to Snow Leopard 10.6
    How did you do that ?

  • Howto downgrade a MacBook Pro from Lion to Snow Leopard

    Preliminary:
    - another Mac running Snow Leopard 10.6.8
    - the Snow Leopard 10.6.3 Retail Install DVD
    - the Mac OS X 10.6.8 Update Combo v1.1 (http://support.apple.com/kb/DL1399)
    - Carbon Copy Cloner (http://bombich.com/)
    - 8GB USB stick
    ### Preparing a USB-Stick with a patched Snow Leopard 10.6.3 Install ###
    - Create an DVD/CD-Master image of the 10.6.3 Retail Install DVD with Disk Utility
    - Eject the 10.6.3 Retail Install DVD
    - Mount the new CDR image in a Terminal
    # hdiutil attach /Path/to/MacOSX-10.6.3-Install.cdr -readwrite
    - Change the current folder to the CDR image
    # cd /Volumes/Mac\ OS\ X\ Install\ DVD/
    - Double check that you are on the CDR image
    # pwd
    - Backup the Kernel
    # mv ./mach_kernel ./mach_kernel-10.6.3
    - Copy the new 10.6.8 Kernel from the Snow Leopard HD to the CDR image
    # sudo cp -pv /Volumes/SnowLeo-HD/mach_kernel ./
    - Copy the 10.6.8 Kernel Extensions from the Snow Leopard HD to the CDR image
    # sudo cp -Rpv /Volumes/SnowLeo-HD/System/Library/Extensions/* ./System/Library/Extensions/
    - Delete all Kext Caches on the CDR image
    # sudo rm -rf ./System/Library/Caches/com.apple.*
    # sudo rm -f ./System/Library/Extensions.mkext
    - edit the Boot.plist on the CDR image
    # sudo nano ./Library/Preferences/SystemConfiguration/com.apple.Boot.plist
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
    <dict>
        <key>Kernel Flags</key>
        <string>-v -f -x</string>
    </dict>
    </plist>
    # cd
    - Now copy the content of the CDR image to the USB-Stick using Carbon Copy Cloner
    ### Snow Leopard Installation on MacBook Pro 8,2 ###
    - Boot your MacBook Pro from the USB-Stick
    - Install Snow Leopard
    - Reboot again from the USB-Stick
    - Select your language
    - Open a Terminal and type
    # cd /
    - Find your new MacBook SnowLeo-HD        
    # df -h
    - Copy the 10.6.8 Kernel    
    # cp -pv  ./mach_kernel /Volumes/MacBook_SnowLeo-HD/
    - Copy the 10.6.8 Kernel Extensions    
    # cp -Rpv ./System/Library/Extensions/* /Volumes/MacBook_SnowLeo-HD/System/Library/Extensions/
    - Exit Terminal
    - Repair permissions on your new MacBook SnowLeo-HD with Disk Utility
    - Quit Installer
    - Now boot from your new MacBook SnowLeo-HD in Secure Mode (hold down Shift while booting)
    - Repair permissions on your new MacBook SnowLeo-HD with Disk Utility
    - Update the Extensions Cache in a Terminal
    # sudo kextcache -e --local-root --system-cache (just ignore all warnings about invalid kexts)
    - Install the 10.6.8 Combo Update
    - Reboot

    Holy Moly!
    Your'e answer is really for those kids with no experience in a terminal.
    The command line is only for pro users and should no be used by any DAU. Therefore no problem at all with "rm -rf" if you have changed into the correct directory first.
    One suggetion is adding these lines to your "~/.profile"
    TERM=xterm-color
    # colors for misc things
    export TERM=xterm-color
    export GREP_OPTIONS='--color=auto' GREP_COLOR='1;32'
    export CLICOLOR=1
    # Set colors
    export LS_COLORS='di=1;36:fi=0:ln=4;34:pi=5:so=4;5:bd=5:cd=5:or=4;91:mi=4;92:ex=35:*.r b=90'
    alias rm="rm -i"
    alias cp="cp -i"
    PS1="(\u) \[\033[01;31m\]\h\[\033[01;34m\] [\w]# \[\033[00m\]"
    Than do a
    # source .profile
    at the terminal prompt in order to active the settings immediatelly.
    Now the "rm" command will always ask before deleting any file or folder.
    Unfortunately if you like to delete a folder containing other folders with several files inside you will go mad!
    One possible intermediate solution is
    # unalias rm; rm -rf ./System/Library/Caches/com.apple.*; alias rm="rm -i"
    But as mentioned before, if you have "sweaty fingers" while typing in Unix commands you should better stay away from the terminal.

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