Mac Mini (Late 2009) Memory Upgrade Problem

Discussion in 'Mac mini' started by wintermac, Dec 6, 2011.

  1. wintermac macrumors newbie

    Dec 6, 2011

    I bought two of the 4GB modules from Both sticks work when placed in the top slot. However, they will not work together. So, I have to use a 4GB in the top slot, and a 1GB in the bottom slot. The Mac mini recognizes 5GB of memory.

    I've attempted to install the memory firmware fix, but the app says that I don't need it so it does not install. Also, I've adjusted the RAM about 10 different ways, but it still leads to a memory error.(mac beeps and indicator light flashes)

    Anyone having a similar problem?

  2. mdgm macrumors 6502a

    Nov 2, 2010
    The Late 09 Mini comes with the necessary EFI firmware pre-installed. On the early 09 Mini the EFI firmware update should have been installed via Software Update back in 2009.

    Sounds like the RAM is bad or incompatible.
  3. wintermac thread starter macrumors newbie

    Dec 6, 2011
    So, both 4G modules work in slot one, but neither get recognized in slot two. They are exactly the same, so they should work together.

    I read something about reinstalling the firmware. Is that something I can try?

  4. cdhutch macrumors newbie

    Jul 26, 2009
    I just purchased a "Kinston 8GB (2 x 4GB) DDR3 1066 Memory for Apple Model KTA-MB1066K2/8G" kit from Newegg: and am experiencing similar symptoms.

    Each module works separately in the upper slot. If one is in the lower slot, I get a 3-beep POST code (RAM does not pass data integrity check). I can get to 5 GB by using a new module in the upper slot with the stock 1 GB module in the lower.

    Thank you,
  5. philipma1957 macrumors 603


    Apr 13, 2010
    Howell, New Jersey
    you do not want to hear the solution. this has been solved with different ram the cheap way or a new logic board the expensive way. this is samsung chip ram

    also this may work

    your logic board or efi is a little bit wrong. ( a guess not a fact ) the 2009 minis are pretty good with all 4gb sticks the 2010 are tougher but the ram I picked above has gotten past the problem for me.

    crucial/micron ram would do the beep trick and so would kingston. only some times. I have done a lot of ram upgrades on 2009 and 2010 and the ram above has been a work around for your problem
  6. cdhutch macrumors newbie

    Jul 26, 2009
    Thanks for the suggestion. I'll give that a try.
  7. Tyr. macrumors member

    Aug 1, 2007
    Antwerp, Belgium
    FWIW I have 2x4Gb Kingston RAM in my early 2009 mini and it works flawlessly. It sounds more like a hardware or firmware issue than a problem with the RAM.

    Try resetting the PRAM and NVRAM and resetting the SMC. You might also try running Apple Harware Test and see if that reports any problems.
  8. cdhutch macrumors newbie

    Jul 26, 2009
    I'll try those steps as well. Thank you!

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