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  1. #1
    A yellow triangle with exclamation mark shows on macintosh hard drive .

    Member Since
    May 08, 2014
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    1
    A yellow triangle with exclamation mark shows on macintosh hard drive .
    A yellow triangle with exclamation mark shows on macintosh hard drive and I can't reinstall os on it.
    Please notice:
    I have MAC PRO machine.
    OS is 10.7.3 .

  2. #2
    A yellow triangle with exclamation mark shows on macintosh hard drive .
    chas_m's Avatar
    Member Since
    Jan 22, 2010
    Location
    Victoria, BC
    Posts
    18,933
    Specs:
    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Chances are very high that you are attempting to install OS X from gray discs intended for a different model of machine, or pirated homeburns or something like that.

    It's also possible that you're trying to install an OS that came out BEFORE the machine you're working with there was made. That's also not going to work out (some details about your machine would have been super helpful here, obviously)

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