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 Forums Macs Notebooks MacBook Pro iPhone Mac OS & System Software iPad Apple Watch Notebooks iTunes Apple ID iCloud Desktop Computers Apple Music Professional Applications iPod iWork Apple TV iLife Wireless