G5 not recognizing memory upgrade

Discussion in 'PowerPC Macs' started by cook.675, Mar 4, 2012.

  1. cook.675 macrumors member

    Sep 24, 2011
    Dual 2.0 GHz Power Mac G5, It's the model on the right on this spec page...


    I just bought 4 x 1GB of PNY DDR PC3200 400 MHz Ram (It specifically says compatible with PC3200 400 MHz on the box)

    I installed the memory, in matching pairs, from the center outward on the motherboard.

    I also made sure the memory was FIRMLY installed, and the latches locked back (although i did notice that black latches on the side of the memory ports did not close AS CLOSE as the original memory that came with the computer) When I noticed this I re-tried to insert the memory to see if the little black latches would close all the way like the original memory but they just don't. I doubt this is the issue but who knows.

    Reboot and still says 1 GB memory. I open up system profiler under memory and it says all the other bays are empty except for the factory units.

    Any suggestions? This memory should certainly work in this computer. Should I try installing this memory where the factory memory is located as an experiment or does anyone know what the problem might be?

  2. Xandros macrumors regular

    Sep 19, 2010
    If the latches don't seem to be clipping all the way into place you more than likely haven't seated the RAM properly. It may seem like a delicate task and you may not want to do it but you have to apply quite a lot of pressure to actually get the RAM to go in correctly. That's not to say this is definitely the problem but it'd be one place to start. Lay the thing on it's side, pull out the modules you've put in then reinsert them, only gradually push down bloody hard until you hear/feel it clicking into place. The latches should go all the way in if it's properly seated.
  3. WalnutSpice Suspended


    Jun 21, 2015
    Canton, Oh
    4 years later I'm having nearly the same issue. I should have 1.5GB RAM, but it still shows 1GB, in system profiler it shows all four slots are occupied by 256MB sticks.

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