So, a few months ago I got a 2GB upgrade for my macbook and when it arrived, I figured I would just pull out one of the 256 chips that was in it and stick in the 2 gig. After I had done so, I tried to start it up and got nothing... wouldn't start. After a short freakout session beings as it was my new macbook, I regained my composure and retried the 2 256 chips, and they worked fine. So I finally just tried the 2GB by itself and it works wonderfully. I have tried reseating the ram chips but I cannot get the 256 to play nice with the 2 GB. Anyone know why? It isn't a huge issue to have the extra 256, but it puzzles me as to why it won't work.