Hello everyone, I am facing a problem. I am trying to upgrade my girlfriends ram to 8gb but whenever I do I get a three beep error at boot, indicating a ram failure. Some info: Macbook info: Macbook pro 13 inch (mid-2009) unibody proc.: 2.26 ghz intel core 2 duo (penryn) ram: currently 2x1gb 1066 MHz Pc3-8500 DDR3 SO-DIMM So in ended up buying this kit from corsair cm3x8gsdkit1066 2x4gb PC3-8500 1066MHz DDR3 SO-DIMM The kit did not work, I was 99% sure I bought the right memory. But I returned it to the store and the employee told me it was not mac compatible (whut?). He had the same problem with the kit, but used other memory that dit work. So he gave me two other sticks, the following: Corsair CM3X4GSD1066 4gb PC3-8500 1066MHz DDR3 SO-DIMM As the specs suggest, totally the same memory. I installed the two sticks and again 3 beeps. I am aware that some macbooks have a RAM limit, but I check the serial and it should be 8gb. I already tried to run the macbook on 1 stick (so only one 4 gb stick), but it would give three beeps and not boot. At first I thought they had given me faulty/broken RAM, but then they did it twice. Should have bought crucial i think. Any help?