5 Replies Latest reply: Jun 4, 2011 3:07 PM by radius688
radius688 Level 1 Level 1 (5 points)

Hello, everyone! Ever since the most recent security update (as of June 4, 2011), my iMac (2.8 Ghz Intel core i7) freezes on a blue screen during start up when I have my USB peripherals plugged in, as well as my Firewire Time Machine drive. The only way I can get the iMac to successfully start is by unplugging everything, starting the computer, and then plugging the USB and Firewire externals in. Has this happened to anyone else, and how can I resolve it?





iMac 27" Intel core i7, Mac OS X (10.6.4), 8 Gb RAM
  • leroydouglas Level 6 Level 6 (14,755 points)

    I would boot from your install DVD and run both Disk Repair and Repair Permissions.



    Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.

    When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (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.

    Click the First Aid tab.

    Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.

    Select your Mac OS X volume.

    Click Repair. Disk Utility checks and repairs the disk.

  • baltwo Level 9 Level 9 (61,825 points)

    If Leroy's steps don't fix the issue, unplug the peripherals, Zap the PRAM and Reset  the SMC, and try again.

  • Carolyn Samit Level 10 Level 10 (95,950 points)
    Mac OS X (10.6.4)   <---  your profile


    If that is correct, updating your system software may stop the blue screen issue.


    Click the Apple menu (top left in your screen) then click:  Software Update ...

    If you system software is up to date ...

    Mac OS X 10.6 Help: If you see a blue screen at startup

  • baltwo Level 9 Level 9 (61,825 points)

    Nice catch about 10.6.4. The latest security update requires 10.6.7: http://support.apple.com/kb/DL1387

  • radius688 Level 1 Level 1 (5 points)

    Thanks, leroydouglas and everyone else! I pretty much did everything everyone suggested. Updated the system software, ran Onyx to clear out the caches and repair permissions, and zapped the PRAM several times. Everything is working OK!


    Thanks again!