MacBook Pro hardware error code

Discussion in 'MacBook Pro' started by chanobo, May 5, 2017.

  1. chanobo macrumors newbie


    Mar 11, 2015
    My MacBook Pro 2011 often does not boot up. When it boots up (After resetting SMC), it will go black out again after working for a while. I ran an extended hardware test and this error code shows up: 4MEM/61/40000000:0x8476f988

    Anyone knows what it means and how shall I fix it? Thanks.
  2. Gav2k, May 5, 2017
    Last edited: May 5, 2017

    Gav2k macrumors G3


    Jul 24, 2009
    The error is related to your memory. It's gone bad. Luckily you can replace it in that model. If you have 2 dimms installed you could try each one separately and see if it's just one.
  3. Fishrrman macrumors G5


    Feb 20, 2009
    It could be either a memory DIMM (itself) that has a problem, or…
    … it could be the RAM SLOT that has the problem (both DIMMs are still ok).

    Sometimes, removing the DIMMs, cleaning the contacts, replacing them may get things going again, but, if that doesn't work...
    ...The only way to find out is to do a step-by-step replacement.

    - remove back, remove both DIMMs (be CAREFUL when you take them out, the tabs that hold them in the slots can break off from mishandling!)
    - mark the DIMMs (example, "a" and "b")
    - put DIMM A into the top slot, put the back on, put a few screws in to hold it in place, boot and run. Try the hardware test. Is it error-free?
    - if so, swap out DIMM B for DIMM A, put back on, retest. What are the results?

    Then move to the bottom slot and repeat the process.

    Obviously, this involves some work. But you need to do a "process of elimination" to find out what's wrong.
  4. chanobo thread starter macrumors newbie


    Mar 11, 2015
    Thank a lot for the advices, I will follow the instructions and see if I can fix it.
  5. Fishrrman macrumors G5


    Feb 20, 2009
    One other thing:
    I believe you'll need a Phillips #00 driver to get at the screws holding the back cover on.
    Be sure to use the right size driver!

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