I have a MacBook Pro 15'' with a intel core duo and it has 2GZH processor. I originally got it in march of 2006 it runs the latest software (Leopard). I tried to upgrade my RAM I bought a Kingston 2GB memory stick I went to install it and when I went to turn it on and it powers up you can hear it but the screen stays black. I have tried every permutation of the two memory sticks the original 1GB and my new 2GB stick. The computer only powers on if i have one memory stick in the slots. Why can wont my computer work on 3GB of RAM? Are the stick not compatible with each other? Is that too much RAM? Help please I have no idea what is wrong someone help please.
The earliest MacBook (Pro) models have a limit of 2 GB. To check the specific model, in the Apple menu select about this Mac. Then press more info... . Look at the line like "Model Identifier: MacBook5,2" for my white early 2009 MacBook. If the numbers are 1,1 then for sure you have the oldest model and are memory limited to 2 GB, as the sum of both cards.
That's just like my wife's, it was a Core Duo and not the current Core 2 Duo. Works fine. I was ready to up its memory but read about this in the Apple Support Forum. It came originally with 1 stick of 512 MB, IIRC. I upgraded it to 2x1 GB for a lot more than the 2x2 GB in the newer. BTW some of the Macs between these only take 3 GB but will work with 2x2 GB just throwing 1 GB away.
-Ken
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