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My Mac Mini Mid 2011 runs very slow. It takes a very long time to boot up and perform basic functions. What steps do I need to take to diagnose the problem?

From my experience when a Mac is running really slow, it’s the hard drive. I have seen this exact behavior on iMacs, Mac Minis and MacBooks. I had a MacBook that was so slow I couldnt even use it. Buy an SSD and clone your hard drive with Carbon Copy Cloner.