5 Replies Latest reply: Apr 21, 2012 10:44 AM by Linc Davis
Guatsiri Level 1 Level 1 (0 points)

What can I do when my computer doesn't boot and it appears a message "panic kernel"?

iMac (21.5-inch Mid 2011), Mac OS X (10.7)
  • 1. Re: Panic kernel
    X423424X Level 6 Level 6 (14,190 points)

    The following should give you some ideas:


    "You need to restart your computer" (kernel panic) message appears (Mac OS X v10.5, 10.6)


    While it is for 10.6 the same techiques apply equally to Lion except that where it talks about installer dvds you have the lion recovery parition.


    See if you machine crashes when you boot in safe mode.

  • 2. Re: Panic kernel
    DCJ1 Level 1 Level 1 (45 points)
  • 3. Re: Panic kernel
    Linc Davis Level 10 Level 10 (117,725 points)

    If you're able to boot, launch the Console application in any of the following ways:


    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)


    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.


    ☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Console in the page that opens.


    Select the most recent panic log under System Diagnostic Reports. Post the contents — the text, please, not a screenshot. For privacy’s sake, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header and body of the report, if it’s present (it may not be.) Please don't post "shutdownStall" or "hang" reports.


    If you can't boot in the usual way, try a safe boot. The instructions provided by Apple are as follows:


    • Be sure your Mac is shut down.
    • Press the power button.
    • Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
    • Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).


    During startup, you’ll see a progress bar, and then the login screen, which appears even if you normally 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.


    Safe mode is slower than normal, and some things won’t work at all.

  • 4. Re: Panic kernel
    Guatsiri Level 1 Level 1 (0 points)

    I can't boot in any case, even in save mode. Always it appears the same kernel panic message. How can I get access to restore hard disk partition. I have a brand new computer with OS Lion. Than you

  • 5. Re: Panic kernel
    Linc Davis Level 10 Level 10 (117,725 points)

    Boot from your recovery partition by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial. When the Recovery desktop appears, reinstall the Mac OS.