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MacBook Pro 4,1 Ram Upgrade

12868 Views 3 Replies Latest reply: Jan 29, 2009 9:26 AM by snatchmo RSS
snatchmo Calculating status...
Currently Being Moderated
Jan 28, 2009 7:44 PM
I'm attempting to upgrade my ram from 2GB to 4GB on an early 2008, 2.5GHz, 6MB L2, MBP. I've purchased 2x2GB, PC-5300, DDR2-667MHz modules and attempted to install them. After installing the two modules my MBP would not boot. I contacted the manufacturer of the ram and they suggested attempting to install one 2 GB module and one of the original 1GB modules. This configuration functions properly. Both 2GB modules have been verified as functional when used with one of the original 1GB modules and have been tried in both slots. Any ideas as to why my MBP will not boot with more than 3GB of memory ?
MBP 4.1, Mac OS X (10.5.6)
  • stedman1 Level 9 Level 9 (50,075 points)
    Currently Being Moderated
    Jan 28, 2009 8:09 PM (in response to snatchmo)
    Hi snatchmo: Your description of the issue sounds suspiciously like an issue with incorrect RAM. There have been quite a few posts on here that are like yours. Work fine with one original stick of RAM and one new one, but will not boot with 2 new sticks. The common thread seems to be RAM that is rated at 800mHz. Is your RAM rated to work at 800mHz, as well as 667mHz? If you have a model/part number on the RAM we may be able check it's specs.

    Hope this helps
    MBP 1.83, 2gB RAM & iMac (Al) 2.4, 4gB RAM, Mac OS X (10.5.6), iPod mini, iPod shuffle, iPod Touch, Apple TV


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