I could not power on my MacBook Air tonight until I held down the power button and accidentally hit the F12 key.  It is 2 1/2 weeks old and I downloaded Mountain Lion 2 days ago.  Help!

I could not start up my MacBook Air tonight, even after making sure the battery was fully charged.  I have had it for 2  1/2 weeks and downloaded Mountain Lion 2 days ago.  This has never happened before.  It started when I held down the power button and accidentally hit the F12 Key.  Is this a problem and what should I do about it?

call AppleCare.

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      a. Open Disk Utility in your Utilities folder.
      b. After DU loads select your flash drive (this is the entry with the mfgr.'s ID and size) from the left
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      d. Select the volume you just created (this is the sub-entry under the drive entry) from the left side
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      e. 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.
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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.
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    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.
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    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.
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    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.
    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.
    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.
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  • TS2986 New MacBook Pro will not download Mountain Lion. The App store simply has a dead download button. Any help?

    New MacBook Pro will not download Mountain Lion. The App store simply has a dead download button. Any help?

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    i downloaded mountain lion for my macbook pro and i want to install it on my sisters' macbook air, my question is, how many times can i share my purchase?

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    I have downloaded mountain lion from the app store on another computer.  I have then gone to find it in "purchases" in the app store on my own macbook pro and it just comes up as "you have not purchased any apps" how to I get my mountain lion?

    Mac App Store: Hiding and unhiding purchases
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    I downloaded Mountain Lion in my  i have macbook pro retina display last month.  but I don't get airplay the option on my macbook.  I went to display preferences, but the airplay is not available.  What is the next step?

    You also need:
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  • HT4854 When trying to download Mountain Lion, I get the following message:  "We could not complete your purchase.  OSX 10.8 Mountain Lion requires a Core 2 Duo, .... processor."  However, my Mac lists a 2GHz Intel Core Duo as its processor.  Help?

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