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  1. #1

    Member Since
    Oct 08, 2013
    Problema installing Crucial RAM on IMac 21.5inch
    Hi there
    I just bought an 8gb pack from Crucial to upgrade my IMac to 12gb.
    I watched a tutorial and the first thing i noticed is that the two RAM memories that are already installed, are on the top slots (with the IMac screen faced down) when in every computer ive seen is the other way.

    Anyways i tried to pull the tab to take the old ones out, and wasnt able to do so!

    I ignored that and continued, and when i tried to put the new ones in, they just wont fit!

    Help please!
    This is very frustrating

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    You didn't mention which 21.5" iMac you have? Year?

    The memory slots on the 21.5" iMac are very tight (I have a 21.5" 2011 iMac) and require considerable force to seat the modules. The same goes for releasing the modules.

    Also, the modules that are already installed are correct. They should be in the top slots (with the iMac face down) and not the bottom slots. All new iMacs come with the top slots populated. Additional modules go in the bottom slots.

    If you bought the memory from Crucial, it's the correct memory. Make sure you're putting the modules in the right way (they will only fit one way). Push down hard with your thumbs (use a soft cloth or gloves) until you hear a slight click, then continue to push until you hear a second click. The module is seated.


  3. #3

    Member Since
    Oct 08, 2013
    Thanks for the quick response!
    My IMac is from late 2009

    I have checked i am putting them in the right way. I pushed really hard but stopped because i was afraid i could brake them.
    All the videos ive seen seemed pretty easy and this is not.
    I havent managed to make them click even once.

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB PCI-e storgae StOS X.13.3
    If you are 100% sure you have the correct memory, there were two 2009 iMacs, all used PC3-8500 modules, download this .pdf from OWC and follow it:-

    Performance Upgrades; FireWire USB SATA Storage; Memory, more at OWC
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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