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.Īt first I thought they had given me faulty/broken RAM, but then they did it twice. I am aware that some macbooks have a RAM limit, but I check the serial and it should be 8gb. I installed the two sticks and again 3 beeps. So he gave me two other sticks, the following:Īs the specs suggest, totally the same memory. He had the same problem with the kit, but used other memory that dit work. You can release the keys after the second startup sound or once the Apple logo appears and disappears for the second time. But I returned it to the store and the employee told me it was not mac compatible (whut?). Immediately press and hold these four keys as it is booting up: Option + Command () + P + R. The kit did not work, I was 99% sure I bought the right memory. So in ended up buying this kit from corsair Ram: currently 2x1gb 1066 MHz Pc3-8500 DDR3 SO-DIMM Proc.: 2.26 ghz intel core 2 duo (penryn) 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.

2009 macbook pro 3 beeps