Hey so i purchased 4GB of RAM earlier today at Fry's Electronic's Anniversary Sale. I purchased the Patriot Memory 4GB (2x2GB Module Kit) of RAM (PSD24G667SK = If it matters) to upgrade from my 1GB that came with my Macbook when I purchased it in December 2006. I'm aware of the "Crucial" program that checks how much RAM your Macbook version is capable of, and it states only 2GB, though many threads and posts not only in MacRumors state that it can actually handle 3.3GB total. Which is why I purchased the 4GB. - I read up on how to replace and install the RAM, though could've easily just seen that little sticker explaining how underneath the battery. I took the both 512MB sticks and stuck in the 2GB's in each slot. Nothing happened. When I tried to turn it on again the Mac's apple start up screen was messed up, even a few times a box came up asking to restart my computer. I kept trying, even switching from only one stick at a time but nothing. I then put back in both original sticks in and only one was recognized under iStat pro and "about this mac." I tried the 4GB's again but nothing at all, either a messed up blue screen or a restart signal. Then I just popped back in the original 1GB and it worked and is recognized....so figured I'd ask for help here before any messes up again if it does... Any help on the matter is truly, highly appreciated.