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I am wondering if I will remove the stock ram of my iMac and buy 2 additional 2x4Gb RAM here @ iFixit will my machine still run? The reason why I asked this is because when I tried to install my 2x4Gb only without the stock RAM, my machine don’t start. I would like to run the machine under 16Gb instead of 12Gb as my current RAM installed.
Not sure I follow what your problem is. You can use both 2 MB & 4 MB memory modules in your system. Here’s the Apple T/N which you should review Install memory in an iMac Do make sure you get the correct memory modules 1333MHz DDR3 SDRAM
