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  1. #1


    Member Since
    Jun 07, 2011
    Posts
    2
    Oldish Imac G5 - powers itself off after about 30 mins
    Good morning,

    Wonder if anyone can offer any advice. I have an iMAC G5 bought in 2005. Its the old white 20" screen one without Isight and with 2 memory slots. It has devloped a fault where it just powers itself off after about 30 minutes. In the past I upgraded the memory from 1 x 256 Dimm to 2 x 512, and I read that sometime this fault is caused by memory so switched back to the old memory but problems still exists. Problem exists while browsng internet, playing cds etc, doesnt seem to be one particular thing that causes the problem, gut feel is that it could be an overheating problem ?

    Its running a really old version of the OS but I didnt want to upgrade while this problem exists as I think it will fail half way through.

    Any ideas what I can do ? Tried looking at official apple support but they say that the machine is too old for them. Do I cut my losses and look to replace or do I try and get this problem sorted.

    Im in the UK.

    Alex.

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,272
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    G'day and welcome to the forums.

    Well your iMac is very fussy about compatible memory. Did you purchase from a Mac dealer or seller? You need low density modules and not cheaper high density PC memory, and what you are describing is exactly what occurs with the wrong memory.

    Have a look at this link and check the specs of the memory you installed.


    http://eshop.macsales.com/item/Other...ng/3200DDR512/
    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!

  3. #3

    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,965
    Specs:
    iMac 2010 27" QuadI7 OSX10.11, iMac 2008 OSX10.11, MBP Late2011OSX10.11 , iPad Air, iPhone 3GS
    Does your iMac G5 power off as in like pulling the power plug from the wall or Panic and display an error?

    If it's power off might be the power supply.

  4. #4


    Member Since
    Jun 07, 2011
    Posts
    2
    Thanks for the responses.

    No, no error messages or anything it just powers off (like pulling the plug as you say).

    I had read about the memory causing this so thats why I put the original back in, but the problem still happens with the original memory (which did work ok for at least 3 years). Original MAC bought from very respectable department store
    The replacement memory was bought from an apple supplier (bit not apple itself) and found by my techie friend, but could still be an issue. Apple itself no longer stocks memory for this as its too old.

    Anyone know how much, and how easy it is, to replace the power supply ?

    Thanks again

  5. #5

    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,965
    Specs:
    iMac 2010 27" QuadI7 OSX10.11, iMac 2008 OSX10.11, MBP Late2011OSX10.11 , iPad Air, iPhone 3GS
    Yours is the Ambient Light Sensor model. What is the screen size? 20" or 17"? I will search around and see what I can find for you.

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