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Message: <blockquote data-quote="rexk" data-source="post: 1383246" data-attributes="member: 243284">The System Profiler in  my Mac Pro 3,1 2.8Ghz (early 2008) shows that all four DIMMs in the A memory card are empty, but they are not.  Both cards are full (4 x 2GB each). I first switched them, and the profiler continued to read that the A card was empty .  I returned them to their original position, and it still reads that all four A card slots are empty.  I ran a hardware test, which recognized all eight DIMMs and reports that they are functional.A) Should I assume then that all 16GB are functional? B) Any idea why the system profiler isn't recognizing the A card DIMMs, and how can I correct this problem?</blockquote>