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  1. #1

    Member Since
    Feb 22, 2011
    Macpro distorted lines freeze on boot
    I have an 2006 macpro, nvidia 8800gt, yesterday my mac froze during diagnostics by onyx, there were green and pink wavy lines on screen, i did a hard shut down then trying rebooting, but immediately i see green vertical distorted lines and the boot doesn't get past by the apple logo. it freezes and have to shut it down.
    i've tried:
    resetting pram, smc
    removing half the ram and then the other half
    installed a new hdd, didn't really matter the same
    i even removed all hdd, the same
    can't start from os x dvd drive, freezes,
    the same for safe mode
    it does enter verbose mode, still the same lines, but i can't read all the commands, it's like it's half towards the left and other half is at the far right, but only the first letter of the commands, it's like i have a second screen.

    now 2 weeks ago, i had a similar problem but my mac didn't even boot.
    i replaced my graphics card and it worked fine, but just for a week, then again the same wavy lines during mac os x environment

    any ideas?
    I'm desperate

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Fort Worth, Texas
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    Try swapping the graphics card again to see what happens. If the graphics card swap doesn't help, you may be looking at logic board problems.

    Maybe someone else who is better familiar with the Mac Pro line than I am can chime in and offer advice.

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac i5 2.7GHz, 16GB memory, OS 10.11.1.
    Open the Mac Pro up and make sure the 8800GT is properly seated and connected to the power take off on the logic board as you have changed the cards from reading your thread, and that should have resolved a graphics card problem.

    After that logic board problems.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  4. #4

    EvenStranger's Avatar
    Member Since
    Dec 09, 2010
    Currently 13" Late 2010 MBA, 4GB/128GB; Early 2011 13" MBP, dual core i7 2.7ghz, 4gb ram, 500gb hd
    I'd also try a different monitor. In making changes, keep in mind the things that have remained the same. You didn't mention swapping out the display, so let's rule that out as well.

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