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I just purchased a Corsair 16GB Memory upgrade for my 2.4GHz 13" MacBook Pro, but I have not been able to make it work.

If I put both modules together or one of the modules alone the Mac wont bootup!

If I put one of the old (original) 2G Memory modules and a new one the computer will work ok and will recognize the 10G memory.

Any advise will be greatly appreciated.

Hector

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According to Apple Support page (support.apple.com/kb/HT1270#link1), the maximum memory for MacBook Pro (13-inc, early 2011) is 8GB. –  Global nomad Feb 17 '13 at 19:12
    
I replaced the ram in my mac-mini and it took multiple reseating for the ram to be recognized, would not reboot, put old ram back in it would reboot, after many tries I was able to seat the ram properly. I don't know if the key slot was to wide thus misalignment or what. I spent about two hours playing with the ram till it worked, its now been over two years with no problems. –  rclyde Feb 26 '13 at 2:54
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2 Answers

While not officially supported, 8GBx2 PC3-10600 modules should work fine. Did you try both the new ones individually with a current 2GB module? If so, I'm not sure there is an option other than getting replacement modules. You could try resetting the PRAM but that's a long-shot.

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Have you tried each of the two 8GB modules by itself?

The first thought that comes into my mind when you state that when you put in both modules it won't boot, and it only sometimes boots when you put in one of the new modules by itself is that you may have one good and one bad RAM module.

Try booting with each of the new RAM modules by itself, if it boots with one but not with the other, then you should return the faulty module to your supplier and get a replacement.


If that's not your problem, I'm also a bit confused about which 13" MacBook Pro you have: the information you give is a bit contradictory, as I don't find one labelled "early 2011" that has a 2.4GHz processor.

According to Crucial, the 2.4 GHz 13" Core 2 Duo Macbook Pro MC374LL/A (presumably from before 2011 when the "early/late year" designation started being used) only supports 8 GB of RAM.

On the other hand, Crucial states that the early 2011 13 inch model does support 16GB of RAM...but its CPU speed is 2.3GHz, not the 2.4GHz you specify: 2.3 GHz Core i7 Early-2011.

If instead you're mistaken about the "early" designation, you might have the 2.4GHz Core i5 Late-2011 , which according to Crucial also supports 16GB.

In summary, it seems that if the processor on your 13" MacBook Pro is a Core i5 or Core i7, then you should be able to upgrade to 16GB, if it's the Core 2 Duo, then according to Crucial your maximum should be 8GB.

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