Uninstall Lion & Reinstall Snow Leopard?

How do I uninstall the Lion suite from my Macbook? I would like to reinstall my Snow Leopard suite so that I can access my PowerPC software that comes with most educational textbook resources. My Lion suite, which I paid for, no longer supports the software (ExamView, etc.).

Downgrade Lion to Snow Leopard
1. 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.
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. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

Similar Messages

Reinstalled snow leopard-error message when try to load updates

Deleted Lion, reinstalled Snow Leopard. After downloading software updates getting message that files may be corrupt and won't install. Have tried twice to install updates. Suggestions?

Thanks. Ran installation disk again and reran Software Update again and everything installed and is running fine.

I have installed mountain lion on my macbook pro ,but it made my mac very slow. Would someone please tell me how to uninstall this one and reinstall snow leopard?

Hello,
I have installed mountain lion on my macbook pro ,but it made my mac very slow. Would someone please tell me how to uninstall this one and reinstall snow leopard? I tried to do it by my original CDs but macbook pro didn't let me to do it.
Thanks

It would be easier to just fix whatever is making your machine slow.
I wrote a little diagnostic program to help show what might be causing these problems. Download EtreCheck from http://www.etresoft.com/download/EtreCheck.zip, run it, and paste the results here.
Disclaimer: Although EtreCheck is free, there are other links on my site that could give me some form of compensation, financial or otherwise.

How do I uninstall mountain lion and reinstall snow leopard

If I had known that I would not be able to use my excel files I would not have purchased OSX Mountain Lion. Is there a way to uninstall mountain lion and reinstall snow leopard?
Thank you,

To get more to the point the answer is the only way to go back to SnowLeopard is if you have a complete backup of your system from before the upgrade.
If you do you would boot off your original SL DVD wipe the disk and install SL and then restore from your SL backups.
Short of that here is no way to go back. But as the others have offered there are other less drastic means to deal with the problem.
regards

Anyone else had trouble getting RID of Mt Lion? I was shocked to learn that I could NOT run some of my software on it and attempted (with online help) to reinstall SNow Leopard. My computer is now in the hospital! I should have been told beforehand.

I 'upgraded' to Mt Lion over the weekend. It seemed very slow, and sluggish. Within a day I realized also that my Reunion program would not work,
my Quicken would not work, and who knows what else. I kept getting alerts saying that I could not use any PC programs. So, I decided to go back to Snow Leopard - I spent two and a half hours on the phone with two very capable people, then was told that I'd have to take it to an Apple Store. I DO have
extended warranty but a lot of good THAT does! Besides, our nearest store is 160 miles away! So, I took it to our local authorized dealer. It is currently
being worked on, and the minimum will be $189! Fortunately, Time Machine was being backed up by my external hard drive. But, I just received a
call and they can't make my password work to get in! Somehow that has changed back to an old one I don't remember!
MY COMPLAINT: When speaking with a rep about the feasibility of downloading Mt Lion, not ONCE did anyone tell me that I 'might' have these
problems. I NEVER would have upgraded! Now I just want my computer restored to USABLE -

What an unfortunate story.   I hope you will quickly get things back to normal.
To be fair though, there has been quite a lot written about the effects of mountain Lion and the loss of Rosetta, as one example.   I am wondering just how much research you did before buying.
But on the brighter side, you can wipe Mountain Lion and reinstall Snow Leopard with not too much trouble.   It would have been much worse had you bought a new machine with M.L. pre-installed and then found your programs wouldn't work.
Message was edited by: seventy one

Reinstalling snow leopard after mountain lion

I am selling my older imac. I have wiped the drive and I want to reinstall Snow Leopard, the operating system it came with. The machine was once upgraded to Mountain Lion. I have the original Snow Leopard disc. I can't seem to reinstall Snow Leopard. Suggestons?

Boot from install DVD for Mac
Erase disk with Disk Utility
Reinstall from DVD
Allan

Can I back up computer with time machine on lion then reinstall snow leopard and restore from backup safely

Can I back up computer with time machine on lion then reinstall snow leopard and restore from backup safely?

If your machine came with Snow Leopard or earlier and you have your install disks, yes, you can reinstall SL. However, you will need to erase the entire hard drive so you will lose all your files. Also note that there are some apps (such as Mail) which can't be downgraded "automatically" such as with a restore from Time Machine. Here is some info on TM:
http://pondini.org/TM/14.html

I have a mid 2010 Macbook Pro running Snow Leopard and foolishly upgraded to Yosemite. Is it possible to go back in time with Time Machine and reinstall Snow Leopard. Then upgrade to Lion or Mavericks? Any other ideas on how I can exit Yosemite?

I have a mid 2010 Macbook Pro running Snow Leopard and foolishly upgraded to Yosemite. Now have numerous problems. Is it possible to go back in time with Time Machine and reinstall Snow Leopard? Then upgrade to Lion or Mavericks? Any other ideas on how I can exit Yosemite?

Once you get yourself back to Snow Leopard, if you still want to upgrade somewhat, I would suggest the following:
1. Get an external hard drive that you can use for experiments with new OS versions. You could partition it into 2 or 3 partitions. You could then clone your existing Snow Leopard system to one partition using Carbon Copy Cloner (well worth $40) or SuperDuper ($25).
2. Buy OS X Mountain Lion for $20, through the Apple online store (I don't think it's available through the App Store). Apple has decided to make it very difficult for anyone to get Mavericks unless they have already downloaded it.
You will receive two e-mails from Apple, one containing a PDF with a redemption code, and one with the password you will need to unlock the PDF. Using the code, you will download Mountain Lion from the App Store, where it will appear among your Purchased items.
After ML finishes downloading, its installer app will launch itself. When you see this launch screen, QUIT the install app immediately! Go to your applications folder, find the Install OS X Mountain Lion app, and copy it to a safe location outside of your Applications folder. Keeping one or more copies will allow you to reinstall without unnecessary aggravation if you later need or want to do that. At this point, you can re-launch the Installer in the Applications folder and let it run. You can install it on a clean partition on your external HD, or you can allow it to upgrade the Snow Leopard clone you created on your external drive, or you can do both. This should allow you to test how everything works for as long as you like.
3. If you left yourself a free partition on your test drive, try a clean install of Yosemite and set everything up from scratch (do not migrate anything). This will allow you to see whether your problems with it were related to something in your Snow Leopard system.

HT3910 How do I erase Mountain Lion and reinstall Snow Leopard?

Can anyone help me erase Mountain Lion and reinstall Snow Leopard. When I had installed Mountain Lion,I discovered that my music notation program, Overture was not working with Mountain Lion. Please help me, years of work is for now lost.

Back up your data files.
Use the Snow Leopard installer disc to completely erase your hard drive and everything on it.
Re-install the SL operating system, then all your applications, then your data files.
If you happened to make a bootable backup clone of your hard drive before installing Mountail Lion then you can just clone the backup back to your drive.

Reinstalling snow leopard on a machine that has mountain lion

Having trouble reinstalling Snow Leopard on a Macbook Pro (aluminum 17", 2008 or so) that is currently running Mountain Lion... advice?

Downgrade Lion/Mountain Lion to Snow Leopard
1. 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.
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. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

How do I Uninstall OS X Mavericks & reinstall Snow leopard?

I want to uninstall OS X Mavericks & reinstall Snow Leopard. Mavericks has disabled iPhotos & some other software I use daily so I want to get rid of this new OS. Anyone know where to start? I can't seem to find my way around this new OS. Thanks.

https://discussions.apple.com/thread/5472040?tstart=0

HELP! How do I remove Lion and reinstall Snow Leopard and my files

HELP! How do I remove Lion and reinstall Snow Leopard & my files BUT I just discovered my Apple Time Capsule which was using Time Machine DIED
I had to go to MacMall and have the Time Capsule data transfered to a new BAK drive($300+$300)
(The Apple Store sent me there as they said they do not do data transfer)
Now what do I do?
? ? One Senior advisor said that I will have to drag and drop the data file or files? from the Time Capsule BAK drive back to my iMAC but will that include all the Snow Leopard operating system ?
? ? Another senior advisor said I will have to wipe my hard drive then install Snow Leopard then "drag and drop", ? ??
All my business leases, database, spreadsheets. letters, mail merge files, and so on are not available with Lion -
I AM VERY ANGRY AS I NEVER SAW THAT WRITTEN ANYWHERE !!!
I am seriously confused and I AM SCARED TO MAKE A MISTAKE-HELP !!
WHAT DO I DO ? AND IN WHAT ORDER? PLEASE HELP!

Your post is confusing to read too.
It sounds like you still have your files on your Mac. Why do you want to back track to Snow Leopard on your Mac? Why can't you read your files from your Mac? If your files are on your Mac, why are you taking them off your broken Time Capsule? You don't have to install Snow Leopard to transfer your files back to your Mac. Maybe step back a bit and explain your situation a little better with details. For instance, what's a BAK drive? Suggest you explain what you are trying to do?
Before you do anything, create a backup of your Mac to another disk drive.. suggest you use Carbon Copy Cloner to make another copy of your Mac.

Reinstalling Snow Leopard over Lion?

Few days back i hve downloaded mac lion "Mac OS X 10.7 (11A511)" from a torrent site.
But now when i m trying to reinstall snow leopard from the installation CD which i got along with my macbook then intallation does not begins.
Following error caution appears while intallation "You can't use this version of the application Install Mac OS X with this version of Mac OS X."
Plz tell me how to reinstall snow leopard and plz tell me teps too as it will help me a lot.

Boot up from your Snow Leopard DVD. Launch Disk Utility from the Utilities menu. Erase your hard drive. Then reinstall Snow Leopard. Restore your personal data from backups. Reinstall your apps from their original install discs, or from fresh downloads from trusted sources. No more torrent sites for you.

Can i uninstall yosemite and reinstall snow leopard

Is It possible to uninstall yosemite and to reinstall snow leopard.I am not happy with yosemite.

Hi Alan I have this problem also and have done the etrecheck here it is. Please be patient with me as I'm not a computer person.
Problem description:
Hi I have just downloaded Yosemite and it has slowed my laptop down I am considering uninstalling and re installing snow leopard.
EtreCheck version: 2.1.8 (121)
Report generated 13 April 2015 5:55:39 pm AEST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Click the [Adware! - Remove] links for help removing adware.
Hardware Information: ℹ️
    MacBook Pro (17-inch, Early 2008) (Verified)
    MacBook Pro - model: MacBookPro4,1
    1 2.5 GHz Intel Core 2 Duo CPU: 2-core
    2 GB RAM Upgradeable
        BANK 0/DIMM0
            1 GB DDR2 SDRAM 667 MHz ok
        BANK 1/DIMM1
            1 GB DDR2 SDRAM 667 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 22
Video Information: ℹ️
    GeForce 8600M GT     - VRAM: 512 MB
        Color LCD 1680 x 1050
System Software: ℹ️
    OS X 10.10.3 (14D131) - Time since boot: 20:9:2
Disk Information: ℹ️
    Hitachi HTS542525K9SA00 disk0 : (250.06 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 249.20 GB (27.51 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
    Apple Inc. Built-in iSight
    Apple, Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
    Mac App Store and identified developers
Adware: ℹ️
    Geneio [Adware! - Remove]
Kernel Extensions: ℹ️
        /Library/Application Support/Symantec/AntiVirus
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        /System/Library/Extensions
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    [not loaded]    com.sierrawireless.driver.SierraHSRSupport (3.0.0) [Click for support]
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    [not loaded]    com.symantec.kext.ips (3.2f8) [Click for support]
    [not loaded]    com.zte.LTEdriver.cdc_ecm_qmi (1.0.2) [Click for support]
    [not loaded]    com.zte.LTEdriver.cdc_usb_bus (1.0.2) [Click for support]
Problem System Launch Agents: ℹ️
    [killed]    com.apple.CallHistoryPluginHelper.plist
    [killed]    com.apple.CallHistorySyncHelper.plist
    [killed]    com.apple.cloudphotosd.plist
    [killed]    com.apple.coreservices.appleid.authentication.plist
    [killed]    com.apple.EscrowSecurityAlert.plist
    [killed]    com.apple.icloud.fmfd.plist
    [killed]    com.apple.Maps.pushdaemon.plist
    [killed]    com.apple.SafariNotificationAgent.plist
    [killed]    com.apple.sbd.plist
    [killed]    com.apple.security.cloudkeychainproxy.plist
    [killed]    com.apple.telephonyutilities.callservicesd.plist
    11 processes killed due to memory pressure
Problem System Launch Daemons: ℹ️
    [killed]    com.apple.awdd.plist
    [killed]    com.apple.ctkd.plist
    [killed]    com.apple.findmymac.plist
    [killed]    com.apple.ifdreader.plist
    [failed]    com.apple.mtrecorder.plist
    [killed]    com.apple.nehelper.plist
    [killed]    com.apple.wdhelper.plist
    [killed]    com.apple.xpc.smd.plist
    7 processes killed due to memory pressure
Launch Agents: ℹ️
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    [loaded]    com.divx.update.agent.plist [Click for support]
    [running]    com.sierrawireless.SwitchTool.plist [Click for support]
    [running]    com.symantec.uiagent.application.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [failed]    com.apple.spirecorder.plist
    [running]    com.eltima.ElmediaPlayer.daemon.plist [Click for support]
    [loaded]    com.ManyCamLLC.videodevice.daemon.plist [Click for support]
    [loaded]    com.symantec.avscandaemon.plist [Click for support]
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    [loaded]    com.symantec.MissedTasks.plist [Click for support]
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    [running]    com.symantec.symdaemon.plist [Click for support]
    [running]    com.symantec.symSchedDaemon.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.nchsoftware.expresszip.schedule.LikeSurvey.plist [Click for support]
User Login Items: ℹ️
    AirPort Base Station Agent    Application Hidden (/System/Library/CoreServices/AirPort Base Station Agent.app)
    iTunesHelper    UNKNOWN Hidden (missing value)
    Skype    Application (/Applications/Skype.app)
    Firefox    Application Hidden (/Applications/Firefox.app)
    TextEdit    Application Hidden (/Applications/TextEdit.app)
    Safari    Application (/Applications/Safari.app)
    Mobile Broadband Manager    Application (/Applications/Mobile Broadband Manager.app)
    Dropbox    UNKNOWN (missing value)
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Internet Plug-ins: ℹ️
    Flip4Mac WMV Plugin: Version: 2.3.8.1 [Click for support]
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    OVSHelper: Version: 1.1 [Click for support]
    DivX Web Player: Version: 3.2.4.1250 - SDK 10.6 [Click for support]
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    QuickTime Plugin: Version: 7.7.3
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Safari Extensions: ℹ️
    Searchme [Adware! - Remove]
    Slick Savings [Adware! - Remove]
    Amazon Shopping Assistant [Adware! - Remove]
    Ebay Shopping Assistant [Adware! - Remove]
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    Flip4Mac WMV [Click for support]
    Norton\nQuickMenu [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 249.20 GB Disk used: 221.69 GB
    Destinations:
        Time Machine Backups [Local]
        Total size: 0 B
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        Oldest backup: -
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        Size of backup disk: Too small
            Backup size 0 B < (Disk used 221.69 GB X 3)
Top Processes by CPU: ℹ️
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Top Processes by Memory: ℹ️
    110 MB    Safari
    99 MB    mds_stores
    71 MB    softwareupdated
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    47 MB    Mail
Virtual Memory Information: ℹ️
    51 MB    Free RAM
    737 MB    Active RAM
    701 MB    Inactive RAM
    399 MB    Wired RAM
    8.97 GB    Page-ins
    443 MB    Page-outs
Diagnostics Information: ℹ️
    Apr 13, 2015, 04:57:56 PM    /Library/Logs/DiagnosticReports/com.apple.WebKit.Plugin.64_2015-04-13-165756_[r edacted].cpu_resource.diag [Click for details]
    Apr 12, 2015, 09:44:34 PM    Self test - passed

Reinstalling Snow Leopard MacBook Air into Mavericks/Lion

Hi!
I have a MacBook Air from 2011 with Snow Leopard on it. I want to wipe my hardrive clean and install either Lion or Mavericks on it. The problem with the 2011 model with Snow Leopard is that you cannot reboot and reinstall it without a USB key, right? So, if I install either Lion or Mavericks on the computer before I reinstall it, will that give me an option to reinstall without an USB key, or is it a permanent condition for the Macbook Air from 2011 to be without an Internet recovery mode?
Thanks in advance!

Phidelphi wrote:
Hi!
I have a MacBook Air from 2011 with Snow Leopard on it. I want to wipe my hardrive clean and install either Lion or Mavericks on it. The problem with the 2011 model with Snow Leopard is that you cannot reboot and reinstall it without a USB key, right? So, if I install either Lion or Mavericks on the computer before I reinstall it, will that give me an option to reinstall without an USB key, or is it a permanent condition for the Macbook Air from 2011 to be without an Internet recovery mode?
Thanks in advance!
While not exactly answering your specific questions, my advice: Partition your hard drive for a new 2nd partition of about 80% of the remaining capacity. Install Lion or Mavericks into the new partition.
That way you have a Snow Leopard partition to work with by "dual-booting" (Startup Disk in System Preferences). If you discover that some of your software will not work in Lion/Mavericks, you have the Snow Leopard option to work with them.
Reinstalling Snow Leopard after a complete wipe/install Lion or Mavericks will be very difficult and time consuming.
BACK UP BEFORE DOING ANYTHING!

Uninstall Lion & Reinstall Snow Leopard?

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