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I also had the problem of one of the two DIMMs not being recognized. It was the one in the upper socket. This socket seems to be harder to get a DIMM to seat into it. Too much of the electrical contacts on the DIMM board will be visible if the board isn't fully seated (visually compare to working one to see difference). I ended up having to use more force than I liked to get it to seat, but it did finally slide in far enough into the socket and upon reboot was recognized so now have two 8GB for 16GB total.