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samsung hdd ssd boot

  1. H

    SSD Boot Issue

    I've got a mid-2012 unibody macbook pro 13". I replaced the original HDD with a samsung SSD and it worked perfectly running El Capitan for 3 months. However- now it doesn't boot and comes up with a gray screen with the prohibition or 'cancel/stop' sign. I have my old HDD which boots...