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can't start

  1. parisinvest

    can't start after upgrade cpu quad to hexa core

    hello i've a mac pro 5.1 2010 2x2.4ghz quad, i was preparing the upgrade to 2x3.46ghz w3690, but after replaceed the cpu, the machine can start with apple diagnostic tone, but it can't go through the start to menu, not to reinstall system, when the start process bar run to about 1 third way, it...