8 Replies Latest reply: Aug 3, 2012 10:57 PM by Kappy
josh270 Level 1 (0 points)

i was using my mac and suddenly by itself if brings me to the login page then when i try to enter my password it shows my desktop for 5 sec then its a blue screen and then it brings me back to the login page.



MacBook Pro, Mac OS X (10.4.11)
  • BDAqua Level 10 (121,620 points)

    Hi Josh,


    Could be many things, we should start with this...


    "Try Disk Utility


    1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.

    2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)

    Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.

    3. Click the First Aid tab.

    4. Select your Mac OS X volume.

    5. Click Repair. Disk Utility checks and repairs the disk."




    Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.


    (Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

  • Kappy Level 10 (263,335 points)

    See if this will help:


    Clearing Caches to Fix Login Problem


    You will need to type some Unix commands. If you are not comfortable with this, I don't know of anything other than a re-install. But if you are careful, you should be OK. I recommend you print this out in a largish mono-spaced font so you don't miss any spaces (or add extra ones). Note that case is important.


    Be careful. Some of these commands are dangerous, since you are going to be root.


    Start up in Single-user Mode. When this has finished you will see a prompt ending in '#', although there may be other messages. Enter the following commands after the prompt:


    /sbin/fsck -fy


    Press RETURN. Wait a few seconds for 8-10 lines of output. If the last line says repairs were carried out, repeat this command until you get a message 'The volume <yourdiskname> appears to be OK'. Then continue with:


    /sbin/mount -uw /

    cd /Library/Preferences

    rm com.apple.loginwindow.plist

    rm com.apple.windowserver.plist

    cd /Library/Caches

    rm -r *

    cd /System/Library

    cd /System/Library/Caches

    rm -r *



    Press RETURN after each command.


    This should now take you to a proper login screen after the normal boot sequence. You should then Repair Permissions by using Disk Utility (in your /Applications/Utilities folder). Don't worry if you don't find one or more of the above files; remove what you do find.

  • josh270 Level 1 (0 points)

    Thanks for the quick reply!


    You see i got this mac 6 years ago and i have no clue where the disk is. Havnt seen it around for a LONG time, is there any other possible way to fix this??


    Many thanks,



  • BDAqua Level 10 (121,620 points)

    Looks like the great Kappy is on the case & has posted what my next suggestion would be, but with even more great info!

  • josh270 Level 1 (0 points)

    Hi Kappy,


    I have seen your instruction on somebody else's post and i have tried this over 100 times and it does not seem to work .



  • Kappy Level 10 (263,335 points)

    Sorry to hear that. If my suggestion didn't help and neither did BD's, then I'd say you are in for a reinstall of OS X:


    How to Perform an Archive and Install


    An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.


    1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.


    Repairing the Hard Drive and Permissions


    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 Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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. Now restart normally.

    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. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.

    3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.

    4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.

    5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.

    6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

  • josh270 Level 1 (0 points)

    rm com.apple.loginwindow.plist

    rm com.apple.windowserver.plist


    Says that there is not such filr or directory

  • Kappy Level 10 (263,335 points)

    Just ignore them if the files are not present, but be sure you have moved into the proper directory:


    cd /Library/Preferences