2012 MBP Memory Upgrade Problem?

Discussion in 'MacBook Pro' started by Dillankid, May 19, 2017.

  1. Dillankid macrumors newbie


    May 19, 2017
    Just upgraded my 2012 MBP to 16 GB DDR3 1600mhz and a 240GB SSD, all from OWC.

    All went smoothly installing, but suddenly apps are crashing and will not stay open (Safari, photoshop).

    I ran diagnostics and got the error
    "4MEM/9/0000000: 0x7ef2ff90".

    From a quick browse it seems like that is connected to the RAM, but everything looks to be compatible so did I miss something important, should I have only got 8gb, or is my RAM (or even SSD) bad out of the box?

    Any ideas? Thanks for any help guys.

    Attached Files:

  2. keysofanxiety macrumors G3


    Nov 23, 2011
    Looks like RAM but HDD cable may also be faulty, as they're notorious for failure on that model.

    Apple have a silent repair program for the cables so worth taking it into an Apple Store for them to check. If the cable is faulty they'll fit a new one.

    I would also recommend returning the RAM with OWC. And yes your model does support 16GB.
  3. Dillankid thread starter macrumors newbie


    May 19, 2017
    I'll try the RAM first since the return is more time sensitive, but will probably do both. I didn't know about the HD cable issue but with the spontanaety of when it just feels like shutting off it would not surprise me at all.
    --- Post Merged, May 20, 2017 ---
    *Thanks for the quick help.
  4. DeltaMac macrumors G3


    Jul 30, 2003
    Your diagnostics error code is one for memory.
    I don't think that error would show itself with a "4mem" code if the SATA cable has a fault.
    STILL possible that the SATA cable is bad, but would be unrelated to the memory error.

    Did you try reseating your new RAM? Swap the sticks between the slots, and make sure the sticks are seated completely.
  5. ZapNZs macrumors 68020


    Jan 23, 2017
    Have you tried placing only one of the two DIMMs in and then running the test to see if you still get an error?

    By running the test with each DIMM individually in each slot (so 4 tests in total), you may be able to determine if this is a single bad DIMM versus a potential issue with one of the memory slots or an issue with both DIMMs.

    IIRC, years ago, when I had a question about bad RAM, Micron advised using a program called Rember or something like that...?
  6. Dillankid thread starter macrumors newbie


    May 19, 2017
    I just replaced the OWC RAM with my old sticks and ran the laptop for several hours on the new SSD. No issues at all, while I couldn't go more than 10 minutes on the new RAM. Going to try to exchange for new with OWC tomorrow. Thanks for the advice guys.
  7. Dillankid thread starter macrumors newbie


    May 19, 2017
    This is a zombie post, but just to put the info out there for potential future searches: The RAM I was originally sent was bad OOB, OWC replaced it with no issue and the new sticks have worked perfectly for months now. My 2012 MBP is working like new with their SSD and RAM.

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