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  1. #1
    Powermac G5 Fault Diagnosis
    Hi all, new to this forum so be gentle, apologies if this is posted in the wrong place.

    I have a late 2005 Powermac G5 Dual 1.8 - Been working great from day one until recently. While using it, it just froze and the fan were stuck on high, no Kernal Panic just frozen.
    Had to turn it off at the button. Pressed the power button to turn it back on and all I got was the LED flashing 3 times. I heard this could be faulty memory so Ive switched them around and removed them to isolate the problem but it still flashes 3 times and wont fire up.

    Blown logic board??

    Any help would be much appreciated.

    Thanks.

  2. #2
    Powermac G5 Fault Diagnosis
    Avenger2SER's Avatar
    Member Since
    Nov 25, 2005
    Location
    Singapore
    Posts
    282
    Your Mac's Specs
    Macbook Air 11" (2012), Macbook Pro 15" (Early 2008), Mac Mini i5 (2012)
    Rep Power
    15
    Have tried unplugging it pressing the powerbutton in for about 10 secs then starting back up? Also, make sure you put the memory back in matching order (Outside sticks matching and progressing inwards). In other words, if your looking down on the memory they should be matched like this (I'm using 4 banks as an example): 1|2|2|1
    Macbook Air 11" 4gb, 128gb SSD (2012)
    Mac Mini i5 16gb, 128gb SSD, 1tb internal, 2x 1tb external (2012)
    MacBook Pro,4gb,128gb SSD (early 2008)
    iMac G3 600, iPad Mini Retina 64gb, iPhone 5, and more.

  3. #3
    Thanks for your help there, I've tried what you have suggested. I knew about the memory formation.

    But it didnt work. Still get 3 blinks on the power button LED.

    Thanks again, more suggestions appreciated.

  4. #4
    Powermac G5 Fault Diagnosis
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,244
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade, macOS Catalina,
    Rep Power
    32
    Well it is not a late 2005, as Dual Core machines came only in 2GHz, 2.3z and 2.5GHz. If you have the original discs that came with the machine, pop in disc one and run Apple Hardware Test which diagnoses logic board, memory, graphics etc. Also check this link out and look at replacing the PRAM battery in your G5.

    http://forums.macresource.com/read.php?1,536585,536961

    Stevo you probably have a PCI-X model known as late 2004/early 2005 model as per these specs:-

    http://www.everymac.com/systems/appl..._g5_1.8_2.html

  5. #5
    Powermac G5 Fault Diagnosis
    Avenger2SER's Avatar
    Member Since
    Nov 25, 2005
    Location
    Singapore
    Posts
    282
    Your Mac's Specs
    Macbook Air 11" (2012), Macbook Pro 15" (Early 2008), Mac Mini i5 (2012)
    Rep Power
    15
    Harryb, it doesn't seem to even get to a grey screen so I doubt booting from the disk will work. It's worth a try tho.
    Macbook Air 11" 4gb, 128gb SSD (2012)
    Mac Mini i5 16gb, 128gb SSD, 1tb internal, 2x 1tb external (2012)
    MacBook Pro,4gb,128gb SSD (early 2008)
    iMac G3 600, iPad Mini Retina 64gb, iPhone 5, and more.

  6. #6
    You're right it wont even power up. Neither will it safe-boot or start from the CD.

    Thanks though.

  7. #7
    Powermac G5 Fault Diagnosis
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,244
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade, macOS Catalina,
    Rep Power
    32
    Sounds like you got a shot logic board.

  8. #8
    Hi there, that link you sent me pretty much described my symptoms. I forgot to mention that the fans come on as well once the power button is pressed and stay on until I've forced the power off.

    What are my options on purchasing another board or is it likely to be a gamble or another ticking time bomb?

    Thanks again.

  9. #9
    Powermac G5 Fault Diagnosis

    Member Since
    Jan 27, 2007
    Location
    *Brisvegas*
    Posts
    5,658
    Your Mac's Specs
    17 inch 2 GHz C2D imac (5,1) with 3GB DDR2 RAM, X1600 (128MB memory) GPU - OSX 10.6.3
    Rep Power
    0
    Well if it's the logic board and nothing else, replacing it will do the job. But in saying that you know the G5 is old technology and it might be better for you to upgrade to a new Mac if you can afford it. Lots of possible options for you.

  10. #10
    Its definitely crossed my mind.... I'd like to maybe go down the patch it up route first before having to fork out loads of money.

    But if I was able to get a second hand board theres so many knocking around but none that seem to be suitable, ie. dual 2.3, 2.0 etc. Do I have to get a specific dual 1.8 for it to work?

    Thanks.

  11. #11
    Powermac G5 Fault Diagnosis
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,244
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade, macOS Catalina,
    Rep Power
    32
    You need precisely the same model board, and there are a couple of different 1.8DP models, PCI and PCI_X for starters. Is your machine a PCI-X model do you know?

  12. #12
    Hi Harry, not a clue, what should I be looking for?

    My logic board number is: KD40700ZCQEJF.630.4914.630T4918

    My G5 serial number is: CK409JE3QVH

    if any of that helps at all?

    Thanks again for your help.

  13. #13
    Powermac G5 Fault Diagnosis
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,244
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade, macOS Catalina,
    Rep Power
    32
    Stevo give these guys a call and see what they come up with, but logix board replacements are probably as dear as another G5 alas!

    http://www.galaxyhp.com/PMG5/parts_pmg5.html

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