How do I erase mountain lion and restore lion on an iMac 27 thats new

Due to compatiability issues with security system I need to go back to 10.7.4 that came with computer. After update to 10.8 I have a lot of hardware that is 10.8 compatible that no longer works. IP cameras , alarm system ect.

If this is on a 2011 model o[r mid 2012 that came with Lion originally boot to the Internet Recovery system. That is booting the computer over the internet.
Hold down the Command+Option+r keys until you see a spinning globe in the center of the screen. Once the Recovery system fully loads use Disk Utility to Re-Partition the drive as one partition. you must do that to completely remove Mt Lion and the Mt Lion Recovery HD partition.
Once that is done exit DU and select Reinstall Mac OS X. Lion will be downloaded and then the install will reboot the system and start the install of Lion.

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    How do I erase mountain lion developer preview and go back to Lion 10.7? I do not have lion or data backed up on my Air
    I need a step by step instructions since I have never done this before, willing to set up partition if needed.

    If you installed Lion from the Mac App Store or got it with the computer, restart with the Option key held down and see if its recovery partition still exists; if it does, tab to it, use the Disk Utility on it to erase the Mountain Lion partition or repartition the drive, and install Lion onto the blank partition. If you installed Lion from the USB thumb drive, use that.
    (65131)

  • How do you erase mountain lion to install snow leopard?

    Hi, My mother now has a new to her late 09 mini that originally shipped with snow leopard. When she bought it it came with mountain lion preinstalled from a private seller. We were thinking that to be on the safe side that it might be better to erase and install what's on it just to be sure it is secure. I tried to erase and install snow leopard from a disk but it says that the installer is not compatible with this version of osx(mountain lion). Question: How do I erase mountain lion and install snow leopard?
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    I think I found the answer (from sl install disk use disk utility to erase then install sl). Thanks for looking.

  • 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.
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    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.

  • How do I install Mountain Lion on both my iMac Desktop and my wifes MacBook

    How do I install Mountain Lion on both my iMac Desktop and my wifes MacBook Pro?

    Open the app store, purchase ML. go to second computer open app store select purchases at the top and click download.  This is provided both computers use the same account. 
    http://www.apple.com/osx/how-to-upgrade/

  • I downloaded Mountain Lion to my IMac and MacPro today, since the download, I am unable to play on-line games in Safari.  On-line game is not connecting due to the https encryption.  How do I resolve this?

    I downloaded Mountain Lion to my IMac and MacPro today, since the download, I am unable to play on-line games in Safari.  On-line game is not connecting due to the https encryption.  How do I resolve this?

    Also the touch screen does not seem to be responding adequately.  Thank you for any help you can give.

  • How can I download Mountain Lion to my computer with a high speed connection and then transfer it to my other computer with a slower connection?

    How can I download Mountain Lion to my macbook pro, which already has mountain lion installed, so I can then install it on my imac which has a much slower internet connection?

    How to create an OS X 10.8 Mountain Lion install drive | MacFixIt - CNET Reviews

  • How do I download Mountain Lion to the other computers at my home without additional cost? I downloaded 10.8 to my main IMac but have two additional computers in my home.?

    How do I download Mountain Lion to the other computers at my home without additional cost? I downloaded 10.8 to my main IMac but have two additional computers in my home.?

    Install 10.6.8 on the other computers. Sign into the App Store with the same Apple ID used to purchase Mountain Lion. Click on the Purchases icon in the toolbar. Locate your Mountain Lion purchase entry which will show an active Install/Download button to the right of the entry. Click on it to download to the computer. If you don't wish to download Mountain Lion twice, then do this:
    Make Your Own Mountain/Lion Installer
    1. After downloading Mountain/Lion you must first save the Install Mac OS X Mountain/Lion application. After Mountain/Lion downloads DO NOT click on the Install button. Go to your Applications folder and make a copy of the Mountain/Lion installer. Move the copy into your Downloads folder. Now you can click on the Install button. You must do this because the installer deletes itself automatically when it finishes installing.
    2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:
    Open Disk Utility in your Utilities folder.
    After DU loads select your flash drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
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    Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
    Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
    Click on the Erase button. The format process can take up to an hour depending upon the flash drive size.
    3. Locate the saved Mountain/Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.
    4. Plug in your freshly prepared USB flash drive. You are going to clone the content of the InstallESD.dmg disc image to the flash drive as follows:
    Double-click on the InstallESD.dmg file to mount it on your Desktop.
    Open Disk Utility.
    Select the USB flash drive from the left side list.
    Click on the Restore tab in the DU main window.
    Select the USB flash drive volume from the left side list and drag it to the Destination entry field.
    Drag the mounted disc icon from the Desktop into the Source entry field.
    Double-check you got it right, then click on the Restore button.
    When the clone is completed you have a fully bootable installer that you can use without having to re-download Mountain/Lion.
    Note: The term Mountain/Lion used above means Lion or Mountain Lion.
    As an alternative to the above you can try using Lion DiskMaker 2.0 that automates the process.

  • How do i intall mountain lion on a new hard drive

    How do i do it?
    I bought a new 13" MBP a few weeks back and have now got my SSD. I realise that Apple no longer give out OS install discs and i don't have mountain lion purchased on my app store as it came with my laptop. So how do i install mountain lion on my new hard drive without having to buy mountain lion.

    Option 1  - Newer Mac's like your come with internet recovery. Which means if your drive fails or is corrupted or in your case your install a brand new drive, internet recovery will let you reinstall the OS you are eligible for. So replace your drive and boot your system with cmd + R keys pressed down for 15 secs or so and your machine hooked to the internet. This will install ML from apple in your case.
    Option 2 - Clone or backup (your entire system using time machine) your hard drive to a external USB disk. Replace your drive and then restore the new drive from the clone or backup.
    Check this site for related articles .... http://nyacomputing.com/category/os/mac-os-x/

  • How do I install a clean version of Mountain Lion (10.8.3) on a new SSD?

    I want to put in a new SSD drive to improve my performance and also re-install OSX.
    How do I put Mountain Lion on a new disk?

    First, put the SSD into an external enclosure.
    Install or Reinstall Lion/Mountain Lion from Scratch
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard 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. Alternatively, 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.
    Erase the SSD drive:
      1. Select Disk Utility from the main menu and click on the Continue button.
      2. After DU loads select your SSD drive entry (mfgr.'s ID and size) from the
          left side list. Click on the Partition tab in the DU main window. Select one
          partition from the dropdown menu under Partition Scheme.
      3. Set the format type to Mac OS Extended (Journaled.) Click on
          the Partition button and wait until the process has completed.
      4. Quit DU and return to the main menu.
    Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button. Be sure to point the installer to the SSD and not your startup drive. Click on the Install button.
    Remove the SSD from the external enclosure and install it in the computer.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.

  • How do I download Mountain Lion?

    I am currently running Leopard (OS X 10.5.8) and am having trouble finding where do download Mountain Lion.  The website says to download from the Mac App Store, but I don't have that.  How do I download Mountain Lion?

    because I want to be able to create a bootable thumb drive.
    Unfortunately, you can't do that with the App Store version. As mentioned, that version of ML will not work with your Mac as it will not contain the necessary hardware drivers. The App Store version is intended only for users upgrading from Snow Leopard or Lion.
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    The only way to have a fully restorable copy of ML is to clone the entire drive to an external drive and leave it alone. Boot to that drive only when necessary to restore it to a hard drive you've replaced in your Mac, or as another drive to boot to when their's trouble with the main drive.

  • I do not have a high speed internet connection. How can I get Mountain Lion on a disk for install?

    I do not have a high speed internet connection. How can I get Mountain Lion on a disk for install on my 24" Imac?

    As long as you use your Apple ID to purchase it, I don't see why they wouldn't let you download the installer on one of their Macs and put it on a pocket drive.
    Or, a friend with a high speed connection?
    I agree with you about the delivery method, just trying to help you get what you want.

  • How do I redownload mountain lion for a clean install on the same machine without purchasing again?

    I purchased mountain lion and upgraded my OS.  The system seems to still be having some issues and I'd like to do a clean install with the new OS.  How do I redownload mountain lion so that I can make a bootable disk and do my clean install?

    You should be able to just go to the App Store and select Download again. If that doesn't work, try holding down the option key while selecting "Buy".
    Good luck,
    Clinton

  • Hi, I have a late 2008 iMac with a new hard drive. How do I install Mountain Lion from my bootable USB flash drive.

    How do I install Mountain Lion to a new hard drive without having the recovery partition on it.
    I have the USB flash drive with software on it but when I switch my Mac on all I have is a white screen & a flashing question mark.
    ATB,
    Steve.

    Did you use LionDiskMaker or DiskMaker X?
    Boot the machine with the option key down until you see your bootable USB stick.  Select the latter, and reboot.
    When the installer boots up, you will first need to choose Utilities and Disk Utility. Select the target HD device name and then the partition tab. Select 1 partition, name it Macintosh HD. Format is Mac OS Extended, and option is GUID. Apply. Exit Disk Utility and return to the installer, which will now show your newly partitioned HD as available for install.
    When OS X is installed and all updates applied, press shift+command+U and run disk utility again. Verify/repair permissions and verify the boot disk.

  • Clean hard drive before selling; how do i get mountain lion on a disk for re-install?

    Hope to resell old macbook pro and wish to clean hard drive. Need a CD of OSX to reinstall after cleaning. How do I get mountain lion on a CD?

    Mountain Lion does not come on discs of any kind. But you don't need one. You'll find instructions for getting your machine ready for sale here:
    How to prepare your Mac for sale

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