TS3824: iMac (Mid 2011): Unresponsive white screen on startup or vertical lines on screen

Learn about iMac (Mid 2011): Unresponsive white screen on startup or vertical lines on screen
Madison91
Level 1 (0 points)

Q: My iMac won't wake from sleep after installing the most recent OS update.

I'm having trouble with my iMac, the screen won't wake up after it goes to sleep. The one time it did the screen was all fuzzy and pink. This has only happened in the last few hours after installing the latest OS X Lion update. Is this normal? Can someone help?

iMac (27-inch Mid 2011), Mac OS X (10.7.5)

Posted on Oct 1, 2012 10:45 PM

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Madison91

Q: My iMac won't wake from sleep after installing the most recent OS update.

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  • by BDAqua,

    BDAqua BDAqua Oct 1, 2012 11:03 PM in response to Madison91
    Level 10 (123,860 points)
    Oct 1, 2012 11:03 PM in response to Madison91

    Hello, not normal.

     

    One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...

     

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

     

    Reboot, test again.

     

    If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.

     

    Check the System Preferences>Other Row, for 3rd party Pref Panes.

     

    Also look in these if they exist, some are invisible...

     

    /private/var/run/StartupItems

    /Library/StartupItems

    /System/Library/StartupItems

    /System/Library/LaunchDaemons

    /Library/LaunchDaemons

     

    Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitiion & use Disk Utility from there to Repair the Disk, then Permissions.

     

    Re-install if that doesn't work.