I have tried two types of Ram on my MBP so far. 1st Komputerbay. Obviously a cheap brand and was not surprised it didn't work. Now I bought the crucial brand from Amazon. Long story short it does the same thing the komputerbay brand did. when I put in both 4gb ram it start gear spinning then freezes. If I do 1 4gb and 1 2gb it will start up and shows the 6gb. How do I get the full 8???? Help!!!!!