I have a macbook os x snow leopard, but by accident I managed to Loaded os x lion. Is it depends to undo?

I have a macbook os x snow leopard, but by accident I managed to Loaded os x lion. Is it possible to undo?
I got the Mac in August 2010 and is 10.7software original.
Thank you in advance!

Check out this previous message thread.

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    rayvonr wrote:
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  • Please help.. How can a RW DVD show up fine in Snow Leopard but not Lion

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  • I have a new l7 macbook pro running snow leopard.  When I try to boot into windows7 32bit, I get either a blue, black, or flickering screen.  Then I have to physically shut down and try again.  At that point it will load correctly.  Any help?

    I have a new l7 Macbook Pro running snow leopard.  When I tried to to install windows 7 32 bit on bootcamp, I kept getting a flicking black and blue screen when it tried to install. (Tried several times).  I finally downloaded the bootcamp windows support to a flash.  I inserted that and finally got it installed.  Now when I try to boot into windows I get either a solid black (sometimes blue) or flickering screen and windows will not start up.  If I then physically shut down the mac and restart, it will finally boot into windows where it tells me that windows was shut down unexpectently and once I click start windows normally, it will boot up.  That will generally let me boot into windows for the remaining of the day.  The next day, the same thing happens again.  I have tried reinstalling several times, and the same thing keeps happening.  It is not my windows disk because it installs flawlessly on the mid 2008 macbook pro.  Anyone know how to fix this?

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  • Recently updated m old 2004 macbook pro to snow leopard 10.6.8, I opened a word doc. and it automatically opened in iwork '08? Now I can not print old or new docs? Help - do I have to update to iwork? Is this an update or do I have to buy iwork?Thanks

    I have a couple of questions? 1. I recently updated my old '04 macbook pro to snow leopard 10.6.8, when I went to open an old word doc., it opened with iwork and will not allow me to print until I update to iwork'08. Do I have to update? If I do, is this an update or do I have to purchase iwork? 2. Can I update my old '04 macbook pro to Lion or Mountain Lion or is this too much? I just purchased and iphone 5 but do not know if Snow Leopard can give me the future updates I might need?? Also does icloud work with Snow Leopard? Thanks for help, I am lost...

    Try resetting your SMC and NVRAM before attempting to install again.
    Resetting the NVRAM/PRAM
    Note: This will not delete any data.
    The NVRAM/PRAM stores information such as speaker volume, screen resolution, startup disk selection, and recent kernel panic information (if any). You should reset the NVRAM/PRAM if you experience issues relating to these functions.
    Shut down the computer by going to Apple () > Shut Down…
    Select Shut Down or allow the computer to shut down automatically.
    Turn on the computer by pressing the Power Button.
    On the built-in keyboard, press and hold the Command (⌘), Option (⌥), P, and R keys before the gray screen appears.
    Continue to hold down the keys until the computer restarts and you hear the startup chime for the second time.
    Release the keys on the built-in keyboard.
    Resetting the SMC of an Intel-based portable Mac with a battery you should not remove on your own
    Note: This will not delete any data.
    The SMC is responsible for controlling various system functions. None of your data will be deleted by resetting the SMC.
    Shut down the computer by going to Apple () > Shut Down…
    Select Shut Down or allow the computer to shut down automatically.
    Plug in the MagSafe power adapter into a power source and then connect it to your Mac if you have not already done so.
    On the built-in keyboard, press the (left side) Shift (⇧), Control (⌃), and Option (⌥) keys and the Power Button at the same time.
    Release the (left side) Shift (⇧), Control (⌃), and Option (⌥) keys and the Power Button at the same time.
    I hope I helped.
    Austin

  • I have recently updated my OS from Leopard to Snow Leopard but now my external hard drive and even my iPhone are not recognized by my Macbook Pro!  Anyone have a suggestion??

    I have recently updated my OS from Leopard to Snow Leopard but now my external hard drive and even my iPhone are not recognized by my Macbook Pro!  Anyone have a suggestion??

    Zap the PRAM and Reset the SMC, then try again. If the problem remains, update to 10.6.8 and repeat.

  • 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.

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