I am currently going to school for ISS and one of my friends wanted to upgrade to SSD and 8gb of ram. I looked it up on apple support and it does in fact support 8gb of ram. When I took the ram out (2x2gb) and installed the new (2x4gb) ram in, slot two shows empty. I switched them from slot 1 to 2 and 2 to 1 and slot 2 is still empty. I also reset the PRAM. When he gets the SSD in I was going to open up and look at three screws, some forums say to loosen them slightly and it will work. Ram slot 1 and 2 are nice and tight. I won't be able to touch the computer for a week or so because he is out of town but as soon as he comes back ill be able to look more. BTW the original (2x2gb) when installed read in slot 1 and 2 as 2gb. Please help thx