Yosemite locks up MacBook Air then hangs on reboot

MacBook Air upgraded to Yosemite 10.10 (I think...can't login to confirm). Randomly freezes when it goes to sleep, won't allow login when I wake it up. I've tried resetting SMC, PRAM, holding SHIFT, pressing that... Nothing. I get nothing. I've read as many threads as there seem to be on the topics. Any other suggestions?
I'd also like to know if there is a simple way to get dual monitors from a MacBook Air, but nothing I've seen indicates it's possible.

Reinstalling OS X Without Erasing the 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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.

Similar Messages

  • I upgraded to OS Yosemite on my MacBook Air...and I cannot upgrade the Adobe Flash download that Adobe keeps asking me to download. I get the screen and when I click on the icon it just creates a new window but not download. Thoughts?

    I upgraded to OS Yosemite on my MacBook Air...and I cannot upgrade the Adobe Flash download that Adobe keeps asking me to download. I get the screen and when I click on the icon it just creates a new window but not download. Thoughts?

    I just tried the link and it is just fine. If the GateKeeper pops up then open Security & Privacy preferences, click on the General tab, set the last radio button to Anywhere.

  • Yosemite slow on Macbook Air

    Help! Seriously....
    I updated to Yosemite the other day and since then my Macbook is extremely slow...
    It is really annoying, especially because I have no clue what the reason could be.
    I would really appreciate if anyone has an idea how to fix this.
    Apple doesn´t seem to know the answer! (What a let down...)
    Thank you very much for taking your time!
    Some of the problems:
    + The fan is running much more often now
    + MacBook gets very warm
    + Battery drain is extremely high
    + Animations and scrolling inside OS not fluent anymore
    I have already tried the following:
    + new install
    + verify disk permissions
    + SMC-Reset
    + PRAM Reset (Cmd+P+R)
    Here comes my report, I really hope anyone can help me with that.
    I am really disappointed of Apple... What a let down!
    Problem description:
    yosemite slows down macbook air
    EtreCheck version: 2.0.6 (91)
    Report generated 20. Oktober 2014 16:22:47 MESZ
    Hardware Information: ℹ️
      MacBook Air (Verified)
      MacBook Air - model: MacBookAir6,2
      1 1.7 GHz Intel Core i7 CPU: 2-core
      8 GB RAM Not upgradeable
      BANK 0/DIMM0
      4 GB DDR3 1600 MHz ok
      BANK 1/DIMM0
      4 GB DDR3 1600 MHz ok
      Bluetooth: Good - Handoff/Airdrop2 supported
      Wireless:  en0: 802.11 a/b/g/n/ac
    Video Information: ℹ️
      Intel HD Graphics 5000 -
      Color LCD 1440 x 900
    System Software: ℹ️
      OS X 10.10 (14A389) - Uptime: 6:6:5
    Disk Information: ℹ️
      APPLE SSD SM0512F disk0 : (500,28 GB)
      S.M.A.R.T. Status: Verified
      EFI (disk0s1) <not mounted> : 210 MB
      Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
      Macintosh HD (disk1) /  [Startup]: 499.05 GB (172.22 GB free)
      Core Storage: disk0s2 499.42 GB Online
    USB Information: ℹ️
      Apple Internal Memory Card Reader
      Apple Inc. BRCM20702 Hub
      Apple Inc. Bluetooth USB Host Controller
    Thunderbolt Information: ℹ️
      Apple Inc. thunderbolt_bus
    Configuration files: ℹ️
      /etc/sysctl.conf - Exists
    Gatekeeper: ℹ️
      Mac App Store and identified developers
    Kernel Extensions: ℹ️
      /Library/Extensions
      [not loaded] foo.tap (1.0) Support
      [not loaded] foo.tun (1.0) Support
      /System/Library/Extensions
      [loaded] com.Cycling74.driver.Soundflower (1.6.6 - SDK 10.6) Support
    Startup Items: ℹ️
      tap: Path: /Library/StartupItems/tap
      tun: Path: /Library/StartupItems/tun
      Startup items are obsolete and will not work in future versions of OS X
    Launch Agents: ℹ️
      [not loaded] com.adobe.AAM.Updater-1.0.plist Support
      [loaded] com.adobe.AdobeCreativeCloud.plist Support
      [loaded] com.oracle.java.Java-Updater.plist Support
    Launch Daemons: ℹ️
      [loaded] com.adobe.fpsaud.plist Support
      [running] com.edb.launchd.postgresql-8.4.plist Support
      [loaded] com.oracle.java.Helper-Tool.plist Support
      [running] com.oracle.java.JavaUpdateHelper.plist Support
    User Launch Agents: ℹ️
      [loaded] com.adobe.ARM.[...].plist Support
      [loaded] com.redgiantsoftware.updater.plist Support
      [running] com.spotify.webhelper.plist Support
    User Login Items: ℹ️
      iTunesHelper ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
      Dropbox ApplicationHidden (/Applications/Dropbox.app)
      Porthole UNKNOWNHidden (missing value)
    Internet Plug-ins: ℹ️
      AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 Support
      FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
      Default Browser: Version: 600 - SDK 10.10
      AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
      AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
      Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
      QuickTime Plugin: Version: 7.7.3
      JavaAppletPlugin: Version: Java 7 Update 71 Check version
    Safari Extensions: ℹ️
      AdBlock
    3rd Party Preference Panes: ℹ️
      Flash Player  Support
      Growl  Support
      Java  Support
      Perian  Support
    Time Machine: ℹ️
      Time Machine not configured!
    Top Processes by CPU: ℹ️
         13% Folder Actions Dispatcher
          6% launchd
          5% launchservicesd
          5% coreservicesd
          4% WindowServer
    Top Processes by Memory: ℹ️
      1.33 GB Folder Actions Dispatcher
      352 MB Safari
      198 MB launchd
      189 MB CalendarAgent
      120 MB com.apple.WebKit.WebContent
    Virtual Memory Information: ℹ️
      127 MB Free RAM
      3.36 GB Active RAM
      3.19 GB Inactive RAM
      997 MB Wired RAM
      2.81 GB Page-ins
      36 MB Page-outs

    Had the same problem, finally realized that the FileVault Encryption was struck at 19%. Speed back up to normal after I disabled FileVault using terminal command - sudo fdesetup diable
    To check whether the FileVault is the culprit, go to System Preferences --> Security & Privacy --> FileVault to see if encryption is in progress.. For me the blue bar was less than a quarter with status 'estimating time remaining'..
    Then open Terminal and type in: sudo fdesetup disable
    It will then ask for the admin password (to be it asked twice), then it was disabled... Back to normal life again..
    Here is my terminal log for reference:
    Last login: Tue Oct 21 23:05:13 on console
    Gowthams-MBP:~ asgowtham$ fdesetup status
    FileVault is On.
    Encryption in progress: Percent completed = 18.80
    Gowthams-MBP:~ asgowtham$ fdesetup status
    FileVault is On.
    Encryption in progress: Percent completed = 18.80
    Gowthams-MBP:~ asgowtham$ fdesetup status
    FileVault is On.
    Encryption in progress: Percent completed = 18.80
    Gowthams-MBP:~ asgowtham$ sudo fdesetup disable
    Password:
    Enter a password for '/':
    ..fdes.
    FileVault has been disabled.
    Gowthams-MBP:~ asgowtham$ fdesetup status
    FileVault is Off.

  • Installed Yosemite om my MacBook Air, resulted in no Sound at all. No input devices no output devices. What can  do? Have had 2 meetings with Apple support with no results.

    Recently, I installed Yosemite on my MacBook Air. After that I had no sound. Not even the start up chime. In Sound preferences there are no input devices and no output devices. I have had three meetings with Apple support with no results. Can anyone help? This seems to be a regular problem.

    Try these in order testing your system after each to see if it's back to normal:
    1. a. Resetting your Mac's PRAM and NVRAM
        b. Intel-based Macs: Resetting the System Management Controller (SMC)
    2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
         Boot to the Recovery HD: Restart the computer and after the chime press and hold down the
         COMMAND and R keys until the Utilities 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.
    3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
    4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.
    5. Reinstall Yosemite 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.
    How to Clean Install OS X Yosemite
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.

  • I want to reinstall os X yosemite on my macbook Air but i erased the hard drive and i cant get the local recovery option; only internet recovery; is there any way to go back and get local recovery option?

    i want to reinstall os X yosemite on my macbook Air but i erased the hard drive and i cant get the local recovery option; only internet recovery; is there any way to go back and get local recovery option?

    Hi Bockworld1,
    I'm afraid you did an error when erasing your hard-drive, this has automatically erased the "local recovery". In order to pass-by this, you must use a former Mac OS X installation DVD (such as Snow Leopard 10.6.3) and then when updated to 10.6.8 you may access the Mac App Store to recover the Yosemite Installer and proceed to a fresh "update" OR creating a Bootable USB Installation drive with DiskMaker in order to alway get a installation copy.
    I also suggest you to create a USB Basic Operating System (you must select a local USB device to install Yosemite or whatever OS you want) with only the base operating system to launch your computer in case of Main Operating System issues.
    Given the amounts of issues reported by users with 10.10.2, I command you to download 10.10.2 version to get a stable OS working.
    Let me know how it is going.
    Good Luck.

  • Why my MacBook Air keeps hanging on System Preferences and Setting whenever I attempt to open it ? ?

    Why my MacBook Air keeps hanging on System Preferences and Settings whenever I attempt to open it ?

    Please read this whole message before doing anything. This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it. Step 1 The purpose of this step is to determine whether the problem is localized to your user account. Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up guest users” (without the quotes) in the search box. Don't use the Safari-only “Guest User” login created by “Find My Mac.” While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin. Test while logged in as Guest. Same problem? After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it. *Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing. Step 2 The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows: 
    Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
    When you see the gray Apple logo, release the shift key.
    If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
     Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. *Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

  • Time Machine Locked after MacBook Air reformatted. My MacBook Air was overfull due to an Address book issue (duplication) so after many attempts to clear space, I ended up wiping out the system and reloading Lion.

    Time Machine Locked after MacBook Air reformatted. My MacBook Air was overfull due to an Address book issue (duplication) so after many attempts to clear space, I ended up wiping out the system and reloading Lion. This resulted in the Time Machine thinking that it was now connected to a different computer. Apparently this diables the existing information. 
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    The path already (unsuccessfully) taken;
    Open Library on the computer, Open Time Machine, Select Correct date, drill down to correct data you wish to restore, click "Restore".
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    Time Machine Locked after MacBook Air reformatted. My MacBook Air was overfull due to an Address book issue (duplication) so after many attempts to clear space, I ended up wiping out the system and reloading Lion. This resulted in the Time Machine thinking that it was now connected to a different computer. Apparently this diables the existing information. 
    Now I can see that the back-ups exist (back to Sept 2012) but they are greyed out, therefore unavailale to restore. Again, this seems like an issue that shouldn't be happening. The whole point of the Time Machine is to enable reinstatement of data after catastrophic failure. What if my computer actually had to be replaced due to a hardware issue? How would I beableto restore anything?
    The path already (unsuccessfully) taken;
    Open Library on the computer, Open Time Machine, Select Correct date, drill down to correct data you wish to restore, click "Restore".
    This did not work because the correct date was greyed out. Restore key was greyed out.

  • Why my MacBook Air keeps hanging on Desktop and Scree Saver indicating "loading photos" ?

    Why my MacBook Air keeps hanging on Desktop and Screen Saver indicating "Loading Photos" ?

    Are you opening iPhoto automatically or via auto-resume at startup?

  • I just installed MacOS X Yosemite on my MacBook Air 2011.  After installing Yosemite I installed the Photoshop Elements 12.1 upgrade, but now when I open the program and try to use the tools, the program freezes.  How do I fix this problem?

    I just installed MacOS X Yosemite on my MacBook Air 2011.  After installing Yosemite I installed the Photoshop Elements 12.1 upgrade, but now when I open the program and try to use the tools, the program freezes.  How do I fix this problem?

    If you use a trackpad and don't want to switch to a mouse, you can uninstall and reinstall all day long and will still have problems, but if you really want to try it, you can download PSE 12 here:
    Download Photoshop Elements products | 12, 11, 10

  • Yosemite slowing down macbook air performance

    Ever since upgrading to yosemite, my 2011 macbook air 11' has been very noticeably sluggish compared to how it was with mavericks. At first i thought it might be from some conflicts from the previous OS, so I did a completely fresh install with yosemite, but it's still dragging and sluggish, especially with any kind of graphics intensive process. I know the air isn't supposed to be a marvel at graphics performance, but I never had these performance issues with mavericks.
    Is yosemite just too resource heavy for my macbook air? I wonder if I'd just be better off going back to mavericks. However, if there's some kind of settings I need to adjust, I'd be happy to experiment. I've already tried the 'reduce transparency' trick, but it didn't do much (not that I noticed anyways).

    Gatekeeper is described here: OS X: About Gatekeeper  - Apple Support. It is only one defense to protect you from inadvertently installing malware, and an effective defense does not rely upon only one method.
    ... I can use software that isn't officially "identified" by apple, even though it is trusted.
    Apple's philosophy is such that a Mac user with Admin privileges always has control over what he or she installs. As I wrote Gatekeeper will serve to protect you against inadvertently installing malware, including the adware that is affecting your Mac. Adware does not get installed on its own - it requires your explicit permission, which you provided by supplying your Admin name and password. When that dialog appears, it should be expected, not a surprise, and its implications should be clearly understood. By providing your credentials OS X concludes you know what you're doing and the reason you're doing it. Determining the "trusted" aspect of software thereby falls to you.
    In your case, by choosing the "anywhere" option you effectively circumvented this basic OS X security feature.
    The problem with adware is that it relies upon deception to convince you that it's legitimate software offered for some beneficial purpose, when in fact all it will do is interfere with your normal activity and possibly crash your Mac.
    Is there anything I can do to possibly identify which apps may be slowing my system down?
    Yes, although you installed quite a number of them. For troubleshooting, read below the line that follows the end of this post.
    An EtreCheck report generated on a Mac as it ships from Apple will show no entries under Kernel Extensions, Launch Agents, User Launch Agents, Safari Extensions, 3rd Party Preference Panes, etc. Everything that appears under those headings is there because you installed them. As I wrote it's a user's responsibility to understand the specific benefits they are intended to convey, the effects they will have, and the means of uninstalling them should they result in unacceptable performance - which was your original complaint.
    It's also possible that the slowdowns are not caused by software, but given the extent to which your system has been modified, hardware failure is less likely than incompatible or poorly implemented software.
    ... anything that isn't officially "identified" by apple is adware?
    Although OS X incorporates specific prohibitions against installing common malware, they can hardly attempt to classify specific user-installed modifications as adware. The only certain way to do that would be to prevent user-installed system modifications altogether, in the same manner as they do with iOS (iPads and iPhones).
    Adware's appearance changes approximately every day. Their pathetic developers are desperate to change its appearance in an effort to continue their deceptive tactics, and a simple change of a file name precludes a reliable automated means of intercepting it. That's the reason it's incumbent upon Mac users to educate themselves about its appearance so that they are not so easily gulled into installing some junk. Gatekeeper merely helps you understand that's what you'd be doing.
    Back up your Mac if  you have not already done so. To learn how to to that read Mac Basics: Time Machine backs up your Mac - Apple Support.
    If your Mac is momentarily unresponsive, consider the following.
    Launch the Console app - it is in your Utilities folder. You can find it by selecting Utilities from the Finder's Go menu.
    If the log list column on the left is not already displayed, show the log list by selecting Show Log List from Console's View menu. Select Show Toolbar if it is not already shown.
    Locate system.log in the list and select it. Many date and time-stamped entries will appear, hundreds of them, and you must find the entries relevant to your Mac's problem.
    To do that click the Clear Display button in the Toolbar. All previously displayed log entries will be disappear.
    Next: Perform whatever actions cause the Mac to exhibit the slow behavior. If the problem is caused by errors logged by the system, the Console window will show them being recorded in system.log.
    One or more of them, along with their time stamps, may reveal the reason for the problem you describe.
    Copy and paste those log entries in a reply. If hundreds of the same repetitive messages appear, please edit them before posting. There should be no need for more than a few log entries.
    Most of the entries will be cryptic but will contain information you might consider personal such as your Mac's name. If you do not want that information to appear, delete or obscure it when posting your reply. Leave enough information so that the entries can be deciphered.

  • HT1727 I downloaded songs onto a MacBook Air, then copied to a new iPod.  I have existing songs on a Microsoft computer that i want to add to the iPod, but it won't allow?  how do i do this?

    I downloaded songs from itunes store onto a MacBook Air, then copied to a new iPod.  I have existing songs on a Microsoft computer that i want to add to the iPod, but it won't allow (it required me to change formatting from Apple to Microsoft)?  how do i do this?

    Syncing to a "New" Computer or replacing a "crashed" Hard Drive: Apple Support Communities
      Recovering your iTunes library from your iPod or iOS device: Apple Support Communities

  • I have lock my MacBook air for everyone. How can I unlock it?

    I have lock my MacBook air for everyone. How can I unlock it?

    If you do it only for your user, you can try resetting permissions > http://osxdaily.com/2011/11/15/repair-user-permissions-in-mac-os-x-lion/
    If this doesn't work, open Disk Utility from Recovery (if you have OS X Lion or Mountain Lion, pressing Command and R keys while your Mac is starting) or the Mac OS X DVD (if you have Snow Leopard or older, pressing C key while your Mac is starting), select Macintosh HD in the sidebar and repair permissions.
    If this doesn't work, reinstall Mac OS X

  • Lock my MacBook Air

    How do I lock my MacBook Air when I walk away? I'd like to set it to require a password to open.
    Thanks!

    lock it physically or password lock?    
    Walk away and come back you could find your Air has "walked away" too.
    Next in System Preferences / Security & Privacy / General, check the Require password for sleep & screen saver; the Disable auto login is the same as that on the previous panel.

  • My Macbook Air keeps hanging on Desktop and Screen Saver of System Preference Setting indicating "loading Photos"

    My MacBook Air keeps hanging on Desktop and Screen Saver of System Preference Setting indicating "Loading Photos".
    Why is that ???

    Welcome to the Apple Support Communities
    Open Finder, select Go > Go to Folder, type ~/Library/Preferences and delete com.apple.desktop.plist

  • Locked up MacBook air 

    My MacBook air is locked and showing the coloured ball symbol. I have shut it down using car/alt/cud and start button, several times, when switched back on, although all applications are closed, it s fine for about 1 minute then it locked up again.

    Can you boot to the Recovery HD?
    Boot Using Command+R keys:
      1. Restart the computer.
      2. Immediately after the chime press and hold down the
          "COMMAND" and the "R" keys together.
      3. Release the keys when the Utilities Menu appears.
    If so, then try repairing the drive:
    Repair
    When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list.  Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu. Select Restart from the Apple menu.
    If the drive is full and you cannot boot from it normally, then the disk directory is corrupted and cannot be repaired. You will have to erase the drive then reinstall OS X. There is no way to recovery your data if it isn't already backed up.
    Erase the hard drive:
      1. Select Disk Utility from the main menu and click on the Continue button.
      2. After DU loads select your startup volume (usually Macintosh HD) from the
          left side list. Click on the Erase tab in the DU main window.
      3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
          the Security button and set the Zero Data option to one-pass. Click on
          the Erase button and wait until the process has completed.
      4. Quit DU and return to the main menu.
    Reinstall OS X: Select Reinstall OS X and click on the Install button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
               because it is three times faster than wireless.
    This should install the version of OS X that you had installed.

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