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Why is my mac rebooting after wakeup

187 Views 4 Replies Latest reply: Mar 20, 2013 12:52 PM by harr44 RSS
harr44 Calculating status...
Currently Being Moderated
Mar 18, 2013 5:26 PM

When I hit the space bar to waken my imac the desktop comes up breifly then reboots itself.

iMac, OS X Mountain Lion (10.8.3)
  • Linc Davis Level 10 Level 10 (107,660 points)
    Currently Being Moderated
    Mar 18, 2013 9:28 PM (in response to harr44)

    If you have more than one user account, you must be logged in as an administrator to carry out these instructions.

      

    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.

     

    ☞ Open LaunchPad. Click Utilities, then Console in the icon grid.

       

    Select the most recent panic log under the heading System Diagnostic Reports on the left. If you don't see that heading, select  

     

    View ▹ Show Log List

      

    from the menu bar. Post the entire contents of the panic report — the text, please, not a screenshot. In the interest of privacy, 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, spin, or hang reports.

  • Linc Davis Level 10 Level 10 (107,660 points)
    Currently Being Moderated
    Mar 19, 2013 7:54 PM (in response to harr44)

    That panic was not caused by third-party software. If the problem is recurrent, the possibilities are:

    1. A damaged OS X installation
    2. A fault in a peripheral device, if any
    3. Corrupt non-volatile memory (NVRAM)
    4. An internal hardware fault
    5. An obscure bug in OS X

    You can rule out the first two possibilities by reinstalling the OS and testing with non-essential peripherals disconnected and aftermarket expansion cards removed, if applicable. Sometimes a clean reinstallation (after erasing the startup volume) may solve a problem that isn't solved by reinstalling in place, without erasing.

     

    Corrupt NVRAM, which rarely causes panics, can be ruled out by resetting it as directed in this support article.

     

    If you've recently upgraded the memory, reinstall the original memory and see whether there's any improvement. Be careful not to touch the gold contacts on the memory modules when handling them. If necessary, clean them with a mild solvent such as rubbing alcohol.

     

    The Apple Hardware Test, though generally unreliable, will sometimes detect a fault. A negative test can't be depended on. Run the extended version of the test.

     

    In the category of obscure bugs, reports suggest that FileVault may trigger kernel traps under some unknown conditions. Most, though not all, of these reports seem to involve booting from an aftermarket SSD. If those conditions apply to you, try deactivating FileVault.

     

    If none of the above applies, make a "Genius" appointment at an Apple Store to have the machine tested. You may have to leave it there for several days. There isn't much point in doing this unless you can reproduce the panic, or if you can't, it happens often enough that it's likely to be repeated at the store. Otherwise you may be told that nothing is wrong.

     

    Print the first page of the panic report and bring it with you.

     

    Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you know how to restore, and you have at least  two independent backups.) Don’t erase the recovery partition, if present.

     

    Keeping your confidential data secure during hardware repair

     

    *An SSD doesn't need to be zeroed.

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