Hi all, new here. I've searched before and can't quite find the answer. I have an early 2011 macbook pro 2.3Ghz i5 with 4Gb (2 x 2Gb) DDR3 RAM. I just purchased 2 4Gb sticks of PNY RAM and am having some issues. When I put both new memory sticks in and boot up my mac I get a black screen background covered in code from a kernel panic and a pop up message telling me to restart. I tried switching the which stick goes into which port but that doesn't seem to work. However, if I put in one new stick of 4Gb RAM and one 2Gb stick that came in it stock, it boots up fine and recognizes that it has 6Gb of RAM. I've tried PRAM resets but nothing seems to work. Any ideas?