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screen frezing

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    MP 1,1-5,1 MAC PRO (EARLY 2009) Freezing up

    Hello. I have a MAC PRO (Early 2009) that is running OS 10.11 and I had this computer since 2009 and has been running great ever since. But I just noticed it started to freeze up. The screen would freeze. I could still move the mouse around but I couldn't click on anything and the keyboard...