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mojave boot problem

  1. Boomish69

    MP 1,1-5,1 Restore or reinstall Mojave on Mac Pro 5.1?

    I decided to test some performance differences between High Sierra and my new Mojave install and booted into my High Sierra backup, unfortunately after this it no longer boots to Mojave, it just goes to a black screen! I tried a PRAM reset but same, If I try and repair the Mojave drive via disk...