I can't use the apple support communities as my apple id won't let me log in, so I made another which also won't sign in. So I am now here!! My problem is I bought this from a friend http://www.crucial.com/uk/store/mpartspecs.aspx?mtbpoid=8C4DD5E1A5CA7304be Where as this is what crucial recommend http://www.crucial.com/uk/store/lis... Core 2 Duo (13-inch DDR3) MB990LL/A Mid-2009 I am now getting these http://support.apple.com/kb/TS3742 Now I could just put my old 2GB RAM back in, but I was wondering if I could solve the problem rather than buying more from crucial? Thanks for any info. Also Hi I will probably drop in from time to time.