Need assistance with Ram upgrade on MBP

Discussion in 'Mac Basics and Help' started by mrmajor, Sep 19, 2008.

  1. mrmajor macrumors newbie

    Joined:
    Sep 19, 2008
    #1
    Hello,

    I have a MacBook Pro (15" 2.16 Ghz Core Duo) running OSX 10.5.4.
    I purchased the machine with the standard 1GB ram module. Recently I decided to upgrade the RAM (to a max of 3GB) and according to Apple, I should be able to install a 2 GB module in one slot, with the original 1GB module in the other.

    I purchased the following RAM module - Kingston KTA-MB667/2G, which apparently is Mac compliant.

    I've tried these tests multiple times, and I've ensured to properly seat the RAM. So here are the results:

    With a combination of the two Ram modules (switching upper/lower slots for each stick): No boot - I hear the disk spin up, the sleep light turns on steady, but the screen remains blank.

    With the original 1GB Ram in either slot: normal boot (1GB recognized).
    With the NEW 2GB Ram in either slot: normal boot (2GB recognized).

    I know both the slots are good, both RAM modules seem to function as well, so there seems to be an incompatibility when combining the RAM modules.
    Therefore I purchase a SECOND 2GB Ram module (KTA-MB667/2G), exact same as my new one, for a total of 4GB. The machine will only recognize/use 3GB (according to the note in the link to the Apple site above).

    So here are the results:
    I first try combining the two 2GB modules:
    With a combination of the two 2GB Ram modules (switching slots as well): No boot - as above.

    With the 1st 2GB Ram in either slot: normal boot (2GB recognized).
    With the 2nd 2GB Ram in either slot: normal boot (2GB recognized).

    Then I try combining my original Ram with the new (2nd) 2GB stick.
    With a combination of the original 1GB Ram module + the 2nd 2GB module (switching slots as well): No boot - as above.

    With the original 1GB Ram in either slot: normal boot (1GB recognized).
    With the 2nd 2GB Ram in either slot: normal boot (2GB recognized).

    I've tried every permutation - always with the same result. I'm dead certain I'm correctly seating the RAM, as the machine always boots normally when there is only one slot used. So what do I do? Is this a problem with the machine? It doesn't seem to be the Ram.... I'm completely at a loss, any feedback would be much much much appreciated.
     
  2. TEG macrumors 604

    TEG

    Joined:
    Jan 21, 2002
    Location:
    Langley, Washington
    #2
    It does appear like there is a problem with the system. I would take the RAM and the computer to an Apple Store and see if they can install it and get it to work, if not, then it would be a problem with the logic board of the MBP.

    TEG
     
  3. ant-macyourself macrumors member

    Joined:
    Sep 1, 2008
    #3
    From my understanding, the Core Duo Macbook Pro's (which I also have) can only accept a maximum of 2GB RAM. The Apple article you linked to applies only to Core 2 Duo systems.
     
  4. mrmajor thread starter macrumors newbie

    Joined:
    Sep 19, 2008
    #4
    Well I'll be.... you're right. I've spent about 120$ on memory I can't use... :(
     

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