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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

Lion does not boot after RAM upgrade, Bootcamp fine


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JCMS

 
Member Since: Jul 18, 2012
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Hey guys.

I just upgraded my MacbookPro (mid-2010 13'') to 8GB of RAM. The original RAM was DDR3-1066 and the new one is 1333. Downclocked to 1066 is has the same latency as the original one and I've done that countless times on other laptops and desktops. Bootcamp is working fine with W7 X64. The ram is recognized correctly and no issues.

However, Lion doesn't boot at all (freezes on the loading screen). Same happens with the recovery partition.

EDIT: If I use 1 of my old sticks with 1 of the new it works fine. Does that mean OS X can't downclock RAM by itself? I was pretty sure this was handled by the CPU Chipset itself...
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ycl1688

 
Member Since: Mar 09, 2011
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Mac Specs: mbp 15 2009, mbp 13 2010

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ram chips are sensitive to apple mbp, if it gets confused, it does weird stuff, better stay with your dedicated number. check crucial.com see the right chips for your mbp.
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JCMS

 
Member Since: Jul 18, 2012
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Yeah just did some reseach. The MBP 13'' Mid 2010 EFI can't downlock RAM on its own. Utterly stupid. It's working on Windows.... I've tried flashing the RAM to 1066 but this model is write protected. Meh. Just lost 20 shipping bucks on a totally stupid design choice.
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harryb2448

 
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Member Since: Nov 28, 2007
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS X.10

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As a suggestion check out a Mac supplier such as OWC, get the full description of the memory modules, and shop around.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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