New ram for my Macbook Pro mid 2009


i bought 2 4gb sticks macbook pro mid 2009 15". when came in, installed , 1 stick worked. switched things around while , found out no matter how switch around, mac not want accept 8gbs or ram! if put 1 of old sticks in , 1 of new sticks in, works fine! whenever try add both sticks in, shows there 1 stick inserted...and yes tried both sticks...and yes tried both slots. have no clue do!

please help,
joshua

p.s. link ram: http://www.amazon.com/gp/product/b0...17145&creative=399369&creativeasin=b002yuf8zg
 



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