Hi all! Yesterday i installed my new SSD in my mac pro 3.1, i did a clean install of mavricks and i just wanted to see if everything was ok! Then i see I only have 12GB of RAM which is weird because i have 8X2GB installed. Then i open then case and see a red light on the memory board. I took out the board (B) and removed the 2X2GB that didnt work and the red light was gone. I also tried just to take and the board and put it back in, but same problem. I also tried to put the working RAM in the same slots as the bad ram and It was working, so i must be the 2X2GB sticks thats just not working? So How is it possible that 2 memory sticks dont work, just from one day to another? And is there anything i can do to try fix it?