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won't boot

  1. bowlerae

    iMac 2011 El Capitan wont Boot after GPU Replacement

    Hello, A few weeks ago my computer froze while I was using it so i performed a hard reset, after which the computer would not boot. I performed every troubleshoot I found online and got it to boot once successfully in single user mode but after about 20 minutes, my screen did a weird thing...
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