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Macbook Pro 2011 (Early) - ElCapitan (OS X 10.11.6) Boot Freeze Last Step (Black Screen) - Fixing Dedicated GPU

Learn how to fix a Macbook Pro Early 2011 running OS X 10.11.6 (ElCapitan) that experiences a boot freeze resulting in a black screen. This article outlines the steps to disable the dedicated GPU and revert to Intel integrated graphics.