Skip navigation

my Imac doesn't reboot: screen is all white

1341 Views 2 Replies Latest reply: Jul 17, 2012 4:47 PM by Kenichi Watanabe RSS
zardi Calculating status...
Currently Being Moderated
Jul 16, 2012 3:06 PM

My I mac is dead.....it stopped during a web browsing.

We switched off and after that only a bip and whote screen

  • rccharles Level 5 Level 5 (5,140 points)
    Currently Being Moderated
    Jul 17, 2012 1:45 PM (in response to zardi)

    This is the first thing that I'd try.

     

    1) You should run disk utility from your system cd/dvd.

         a) verify the disk

         b) update your permissions.

     

    2) Try a safe boot.

        Shutdown your machine.  Hold down the shift key.  Poweron.  Wait awhile Wait awhile while you harddrive

          is being checked.

        http://support.apple.com/kb/ht1455

     

     

    Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime. Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:

     

    reset-nvram

    set-defaults

    reset-all

     

    "The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."

    http://support.apple.com/kb/TS1812?viewlocale=en_US

     

    How to eject a cd from the internal cd drive:

    eject cd

     

    List of devices:

    devalias

     

    List of variables:

    printenv

  • Kenichi Watanabe Level 7 Level 7 (29,995 points)
    Currently Being Moderated
    Jul 17, 2012 4:47 PM (in response to zardi)

    You may want to reset the PMU (power management).  How you do that depends on the specific iMac model.  It generally involves disconnecting the Mac from power, with some additional steps.  Can you identify your iMac model precisely?  This web page has a list of all iMac models, to help you.

     

    http://www.everymac.com/systems/apple/imac/index-imac.html

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.