This to me suggests that when the PC tries to tap into that extra memory, it hits a terminal error and just flat out fails. Going off of what you did, pulling the memory, and the response, that would seem to be the issue. Which sucks because it suggests that the slot itself might be bad or that part of what allows the CPU to utilize that slot could have an issue. It's not entirely bad because the BIOS and Windows DO SEE it. But, when it tries to actually utilize it..... bad crap happens.
In any case.... it points out to a bad mobo. Is it still under warranty? Which socket is it?
The sticks themselves might not be matched up or have issues also. There may be issues with one or two of the 4 sticks. This is one of the reasons why I generally try to grab sticks with larger capacity.... reducing the number of potential places that problems might occur. You might be able to utilize the two old sticks and the "known good" sticks out of the 16 gig set.
Did you try this?..........
http://www.winsiderss.com/tools/meminfo/meminfo.htm
Kind of a brute force tool to tell you where exactly memory is allocated..... though, going by what you said above... I'm leaning towards there being an issue with the hardware.


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