New memory fitted, now turning off randomly

Discussion in 'iMac' started by eddjedi, Jan 3, 2012.

  1. eddjedi macrumors 6502

    Sep 7, 2011
    I have just upgraded my 27" iMac to the full 16GB RAM. It recognises it fine, however the computer has started rebooting randomly. No warning, it just turns off, and then bizarrely there's no error message when it restarts (in my experience the computer usually knows when it has crashed and offers you the chance to send an error report.)

    Here is the exact memory I bought:

    It was cheap, but does claim to be good quality. Can anyone give me any ideas as to why the computer just turns off? Are there any error logs I can check?
  2. wpotere Guest

    Oct 7, 2010
    Bad memory.... You likely have a bad module.
  3. maflynn Moderator


    Staff Member

    May 3, 2009
    defective memory. Take a step back and look at the big picture.

    You upgrade your computer and it suddenly becomes unstable. The odds are quite high its bad ram.
  4. eddjedi thread starter macrumors 6502

    Sep 7, 2011
    Thanks for the reply. Is there any way of actually testing which module is bad? Or seeing if the iMac considers it compatible? I want to have some idea of what I'm talking about before going back to the seller and complaining.
  5. Consultant macrumors G5


    Jun 27, 2007
    Use your computer with 3 chips at a time to figure out which RAM module is bad.

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