Blinking question mark folder upon startup on a 2 month old Pro?

Hi I had the grey screen on my macbook pro. I tried reinstalling maverick os x, but my wifi connection got interrupted and so did the download. I now have the blinking question mark folder upon start up. What can I do since I know it's probably not a hard-drive problem?

Startup Issues - Resolve
Startup Issues - Resolve (2)

Similar Messages

  • Question-mark folder upon startup? what's going on!?

    hello users,
    when i turn on my IMAC, instead of booting up, it gives me a screen with a blinking folder with a question mark. i don't need to save any data, i just need to boot up and do an erase and install with leopard. how can i do this? any help is appreciated, thanks.

    Power on the Mac. Immediately after turning on the power, hold down the option key.
    Continue holding the key. Eventually, the screen will turn blue, and a number of disk icons will appear. (equal to the number of disks in your system, including any indserted CDs) There will be an additional image of an arrow (pointing to the right.)
    If any disks have what the system considers to be valid bootable OS's installed, the OS logo (either the OSX logo, the windows logo, or the OS9 logo) will be superimposed on the disk icon.
    Click on the OS of choice, then click the arrow.
    The system should boot to the chosen drive and OS.

  • Blinking question mark folder icon on startup (but not always!)

    I recently obtained a new hard drive (Western Digital 80gb) and installed the Mac OS on a 500 mhz Cube; the DVD drive was not recognized but I removed the jumper on the drive pins rendering the disc a master and finally, the DVD drive was found so that I could perform the OS install. The problem is that if I start up the Cube after a long period of time having been OFF (e.g., 5 hours) there is the blinking question mark folder (Mac OS logo alternates with question mark). After 3-4 minutes, the startup disc is finally located. Now, if I do a cold restart a few minutes later, there is NO problem on startup. My startup issue always occurs after a longer period of time with the Cube having been OFF. There is a new battery installed, permissions are fixed, the drive checks out without problems with disc utility. What could be the problem?

    Probably your PRAM battery is gone. This stores information such as your preferred startup disk. I know you said you put in a new battery but have you actually tested it? The computer being off for several hours really, really sounds like a bad battery. Also check the terminals both on the battery and in the machine aren't corroded and it is seated correctly.
    [Texas Mac Man's PRAM, battery, PMU tutorial|http://www.geocities.com/texas_macman/pram.html]
    [Apple's PRAM reset directions|http://docs.info.apple.com/article.html?artnum=2238]
    If you have a digital multimeter you can check the condition of your present battery. It should read at least 3.2V if it is the 3.6V half-AA battery type. Ideally this should be measured while the battery is under load; added recommendation from Hans777:
    I have recently found out that an exhausted battery will still indicate >3.6 V with a high internal resistance VM.
    Checking incircuit: powercord disconnected press PMU reset button for >about 5 sec before measuring.
    Checking outside: load the battery with a 1500 Ohm resistor when measuring.
    [Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3|http://docs.info.apple.com/article.html?artnum=86760]
    Message was edited by: Limnos

  • Blinking question mark folder with only OS X base system left

    Yesterday I turned my laptop on to see a blinking question mark folder. I searched through a lot of people questions with the same problem however mine is not the same because I only have the OS X base system left. I can't redownload the OS X lion because there is nothing to download it after I chose the option to redownload it. I see that most people have the Macintosh HD but I don't have anything like that.
    disk1
         Mac OS X Base System
    that's all I see when I try the repair option?

    Have you tried booting to your Recovery HD (if you are running Lion or Mountain Lion?) If not and if you were running Lion or Mountain Lion, then:
    Question (?) Mark, Blinking Folder, or Gray Screen at Startup
    These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
    A flashing question mark appears when you start your Mac
    Mac OS X- Gray screen appears during startup
    In most cases the problems may be caused by:
    Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
    Boot drive's directory has been corrupted - Repair with Disk Utility.
    Critical system files are damaged or deleted - Reinstall OS X.
    The disk drive is physically non-functional - Replace the hard drive.
    Repair the Hard Drive and Permissions
    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. 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 installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD:
    Boot From 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.
    Reinstall Snow Leopard Without Erasing The drive
    1. Repair the Hard Drive and Permissions
    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. 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 installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    2. Reinstall Snow Leopard
    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
    Download and install Mac OS X 10.6.8 Update Combo v1.1.
    Reinstalling Lion/Mountain Lion 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 Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

  • I see that i have a problem after installing my new hard drive on my macbook pro mid 2009 version. I put a new hard drive, with all of my information from my old drive installed on it, into the computer. but now have the blinking question mark folder

    i see that i have a problem after installing my new hard drive on my macbook pro mid 2009 version. I put a new hard drive, with all of my information from my old drive installed on it, into the computer. but now have the blinking question mark folder. I see that it means that it isn't reading the new hard drive.
    did i miss a step between transferring all of my information from my old hard drive to the new hard drive and installing the new hard drive into the computer. I believe that i installed properly. it was quite easy.
    thanks for your help

    It means there is no bootable system on the drive. If you still have access to the old drive, then I suggest you boot from it then clone it to the new internal drive. Use OPTION boot to boot from the Recovery HD on the old drive:
    Boot to the Recovery HD:
    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.
         1. Select Disk Utility from the main menu then press the Continue
             button.
         2. Select the destination volume from the left side list.
         3. Click on the Restore tab in the DU main window.
         4. Select the destination volume from the left side list and drag it
             to the Destination entry field.
         5. Select the source volume from the left side list and drag it to
             the Source entry field.
         6. Double-check you got it right, then click on the Restore button.
    Source means the external old drive. Destination means the new internal drive.

  • Question mark folder at startup, safe boot not working

    Last night my iMac froze up, Force Quit didn't work, and I used the Power button to shut it off.  When trying to restart, it was getting stuck at the grey Apple.
    I tried unplugging the peripherals and restarting; zapping the PRAM and restarting; safe boot and restarting.  Safe boot did it.
    I then ended up going through those steps a few more times as my iMac starting freezing up again.  One of those times I changed all my applications in the dock that were set to launch at login to not do so, wondering if that was somehow causing a problem.  I also took a folder of recent items I'd created, mostly a LOT of PDFs of newspaper articles, burned it to a DVD and deleted the folder to free up more memory if that was part of the problem (I'm running out).  I then restarted from the Apple menu and it shut down through safe boot and then restarted without safe boot and did so just fine.  I ran Disk Utility and very few if any permissions needed repairing.  And it was operating OK for a bit and then froze up again.
    Now I'm getting the question mark folder at startup and safe boot isn't working.  What should I be trying next?  Lion Recovery with Command-R?  I'm relatively new to Lion, but it had been working OK for me for a while now.
    What other things should I try?  Would Target Disk mode possibly work from the MacBook I'm using now, which doesn't have Lion installed?

    The question mark folder usually means that the
    firmware could either not find a valid operating
    system to boot, or, it could not find a hard disk
    with an operating system on it.
    Have you tried booting to Lion Recovery?  If
    you can, then go into Disk Utility and do a
    Repair Disk on your OSX volume.  If the
    OSX volume is not showing up, you may need
    to do a reformat and re-install.
    Since it is a 24" iMac (from your description) it was
    a pre-Lion Mac.  If you still have the original install
    disks, try booting with it and use Disk Utility from it
    to see if the hard drive is working.
    Try this first before making a road trip.

  • Blinking question mark folder - Please help to restore from USB

    Hello,
    I haven't been able to my Mac about 5 days now and I hope someone can help me.
    I initially had Yosemite then using disk utility I erased the hard drive, after that I was going to install Yosemite again as a fresh copy and mac froze so I had to restart now its showing a blinking question mark folder. I was able to do an internet recovery but it was trying to install Lion.
    I currently have a copy of Maverick and would like to install that. I am at this screen as show in the picture: I have selected the source as the Maverick file on
    the USB and the destination as the HD; should I click restore and would that install the Maverick OS or is there another way?
    Thanks
    the

    nazfaz wrote:
    Is there a way to install Yosemite since I had downloaded it via my ID?
    You have to reinstall OS X Lion, setup your account, log into the App Store with the Apple ID you used to download Yosemite and you should see it in your Purchases tab. Then you can download it and install it. What I would do is download it, quit the install and save the Install OS X Yosemite.app file out of your /Applications folder to another location so you can create a USB thumb drive installer. Then go back into /Applications and run the install app to upgrade from Lion.
    Unless you have an OS X Yosemite USB thumb drive installer, you can't install Yosemite again until you do the above paragraph and upgrade.
    If you have the Install OS X Yosemite.app on another Mac to create a USB thumb drive, create it and boot from it to install Yosemite.

  • Mbpro won't start up- get blinking question mark folder

    help!!! think my macbook pro (1st gen, 17") has died- i get a blinking question mark folder when i boot up.
    it's been having problems for a long while, so use it generally to record movies- which a bunch are still on there to export.
    is there a resolve for this? would a new harddrive get it up and working again?
    hoping i can recover the harddrive  to get data, but ok without it. just want it working again if possible.
    thanks for the help!

    The symptom you describe is usually a HDD problem or it could be an internal cable/connection problem.  If you have an external bootable HDD, employ it and see if you can access the internal HDD via Disk Utility and run First Aid.
    Ciao.
    http://support.apple.com/kb/TS1440
    The above article may be useful.
    Message was edited by: OGELTHORPE

  • My iMac has a blinking question mark folder on it and won't let me boot.

    I have a late 2009 27 inch iMac whos hardrive failed a while back. A couple days ago i decided to pop in a new hard drive in it, the same brand, just different capacity. I wanted to put windows on it, and tried to boot it with pressing c on the keyboard at startup but encountered a few problems.
    When i power on my imac the screen is just a blank white screen for about 20-30 seconds. During this time, any devices plugged into the USB ports do not work. My mouse is not lit up, and my keyboard will not react to pressing caps lock, num lock etc. After that 20-30 second period the folder with the blinking question mark on it pops up. I tried holding C, as well as windows key and C but nothing seems to make the mac recognize i want it to  boot from other devices.
    The hard drive i installed is empty (obviously) So i'm not sure if its an issue with the way I installed the hard drive (pretty sure i did it right) or another issue that may involve trying to put windows on it. Also worth noting is im using a normal USB mouse, and a normal USB keyboard, not mac devices. I'm willing to put OSX on this computer if its necessary to make it work, but right now all i can get on it is that white screen and then the blinking folder. Does anybody have any idea how to fix this?

    Drive Partition and Format
    1. Boot from your OS X 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. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
    4. 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.
    5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
    6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
    When formatting has completed quit Disk Utility and install OS X.

  • I get a question mark folder upon start up

    My Mac has been freezing up lately, now at start up I just get a grey screen with a question mark folder. Anyone have any suggestion?

    Question (?) Mark, Blinking Folder, or Gray Screen at Startup
    These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
    A flashing question mark appears when you start your Mac
    Mac OS X- Gray screen appears during startup
    In most cases the problems may be caused by one or more of these:
    Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
    Boot drive's directory has been corrupted - Repair with Disk Utility.
    Critical system files are damaged or deleted - Reinstall OS X.
    The disk drive is physically non-functional - Replace the hard drive.
    Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service.
    Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. If you perform any work yourself that is unapproved by Apple, then you will void any warranty you may have and lose all further Apple Support.
    Repair the Hard Drive and Permissions
    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. 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 installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD. Simply boot from the Recovery HD to perform the above.
    Reinstall Snow Leopard Without Erasing The drive
    1. Repair the Hard Drive and Permissions
    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. 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 installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    2. Reinstall Snow Leopard
    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
    Download and install Mac OS X 10.6.8 Update Combo v1.1.
    Reinstalling Lion/Mountain Lion 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 Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

  • Imac g3 os; blinking question mark, folder on boot

    Thanks for your help Nick. I did as you said.
    selected startup disk, then clicked on macintosh hd
    and clicked on restart.
    When it restarted, the blinking question mark
    inside the folder appeared.
    Am I having a possible hard ware problem of
    some kind ? Have tried shocking pram already.
    Is it bad pram battery, or maybe a
    hard drive problem ?
    Maybe one bad memory stick ?
    I am lost here. New to macs.
    Any help would be appreciated.

    Please stick to the other topic. This is in a round about way a duplicate. You will confuse yourself if others answer here.

  • Blinking question mark folder, new hard drive

    Okay so I've been having this problem for a couple weeks now. My computer was running a bit slowly when I was watching videos online, and it froze so I forced a shut down. It turned back on and it worked for a couple minutes, but then it froze again and when I attempted to reset it I got the scary blinking question mark. I went through all the options to fix it, but the computer could not find my hard drive. When I tried to repair disk no hard drive came up, and when I tried to re-install ios x it also could not find a hard drive. I confirmed that the hard drive had died so I purchased a new one, but now that a new one is installed I cannot re-install ios x because the computer won't read the disc. Under the utilities menu it shows that the disc is there, but it just won't re-install.
    I checked on another computer and confirmed that the disc still works. I put it in my computer upon start up and got no response from the machine. Instead of getting the blinking question mark, the screen just stays gray.
    My computer is a 2012 macbook pro. The disc I had to buy online because it did not come with my computer, and has OS version 10.5.2 on it.
    Thanks

    Hello,
    A mid 2012 MBP should still be covered under AppleCare!?
    Anyway, that MBP won't boot/use/run 10.5.anything, it came with...
    Pre-Installed MacOS: X 10.7.3 (11D2515)
    If you have an Apple Store nearby they can reinstall 10.7 or newer on it, 10.7 & up is only availble from a Download, not on Disc.

  • Question mark folder at startup

    When I start up my computer, there is a question mark folder at the start and then it pops to the apple icon. I was wondering if anyone else has this problem and is it a software or hardware problem?

    That symbolises no set startup disc, its often a tricky one to fix, but your mac starts up so be grateful my mate with a black macbook had to have the whole hard disk re-imbersed, if the problem is bugging to such an extent its driving you insane the only things i can think of are: Re-Install Mac OSX, Do a hardware test ( insert disk 1 and hold D on startup) or goto system preferences>startup disk and make sure the hard disk osx is installed on is set as the very first it looks for.
    Hope i helped
    bob
    2.3Ghz Macbook White_Late 2006   Mac OS X (10.4.3)   I build comps for a living and have a custom P2 in my room

  • After upgrading HD, "question mark" folder on startup

    Hi,
    I recently upgraded my Macbook Pro Core Duo 15" harddrive. Everything went fine and still is. The only problem is the following : when turning on the computer, the infamous "question mark" folder will show up, blinking. Nothing else will happen... Unless I turn it on while holding the option key (ALT). In that case, the new HD shows up and I can select it : the boot sequence then goes on as usual. And everything else is fine. The HD was correctly formated (I have two GUID partition on it). I did not made a new install of Leopard : I cloned my old HD on the new one before installing it.
    Any idea how I can get ride of the question mark? How I can get the computer to boot without having to hold de ALT key and then chose the internal HD installed in it?
    Thanks a lot.
    P.

    Well, that was as fast as it was efficient. Thank you very much for pointing me in the right direction. Everything work just fine now.

  • Question mark folder on startup, Question mark folder on startup?

    Have startup problem with question mark folder flashing on startup. How do I fix it?

    Reinstall OS X without erasing the drive
    Do the following:
    1. Repair the Hard Drive and Permissions
    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. 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 installer.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    2. Reinstall Snow Leopard
    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
    Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

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