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I bought two 1GB ram modules from crucial.com and installed them on my macbook. When I took out one of the 1GB Ram chips and installed the originally 512 MB ram chips it worked fine and recognized 1.5 GB of ram. I then swapped out the 1GB ram chips and it worked the same. I reinstalled the two 1 GB ram chips and the macbook just stays in a black screen with a flashing indicator light on the right corner of macbook. Has anyone had this problem and if so, please help!