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Powermac G5 start-up issues

Discussion in 'PowerPC Macs' started by biquet82, Sep 5, 2012.

  1. macrumors newbie

    My Powermac G5 refuse to start normally: sometimes, it boots perfectly, sometimes it doesn't.

    Switch on the G5: fans spin, no chimes, no keyboard, no video, fans accelerate few minutes after...I can just push the power button to switch off the G5.

    So, I clean up the G5, disconnected firewire matérials, ram, replace it, disconnected video card, hardrives, I bought new pram battery. Nothing changes.

    But, when it starts, the Mac is fully fonctionnal...

    Please someone help me ? :(
  2. macrumors 68040


    Is it random or on cold boot only?
    Did you notice one CPU disappear when it starts and works (if it's DP ofc)?

    Either could indicate bad logic board (second one bad CPU too).
  3. macrumors 6502a

    Zeke D

    I have noticed that g5s don't like soft boots. I disable sleep mode and only shutdown then start up.
  4. macrumors newbie

    Thank you for your answers.

    Yes, it's random. There is two days ago, in the evening, it start up 3 times.
    Yesterday, it can't boot...the white front led illuminate, but no boots.

    I don't know how to do to get this information. Can you explain more about this, please?

    Sorry, but what is soft boot?

    Another point I used to get, I don't know if it's very important for G5 trouble, I try to explain :eek::

    For example, I'm running with leopard 10.5.8, and I want to quit/restart.
    2 choices: reboot, or shut down.
    - With shut down, no problem.
    - With reboot option, it will crash on start up, with black screen, no chimes, no video, like the big problem in this subject.
    If I want to reboot, I must to shut down, then switch on the G5, after waiting few minutes.

    Sorry, I hope someone understand..
  5. macrumors 68040


    Under About this Mac -> More info -> Hardware -> Number of processors

    I had this exact issue in two G5 2.0 DP, and sometimes when it finally booted one CPU was missing in System Profiler. I assume that one of CPUs was bad in either case because I've tried two different logic boards and it didn't help. Unfotunately I had no working matching CPUs to test it in reverse way.
  6. macrumors 601


    If a CPU went out that should trip a red diagnostic LED.

    My guess is video card going out.
  7. macrumors newbie

    OK, thanks, now it's hard to see "about this mac" section, because it doesn't start everyday .. I need to be lucky :rolleyes:

    Just video card, would be a great news !
    Do you think I may replace video card first?

    I guess this is AGP 8X video card (?), can you suggest a video card or where to find a nice one somewhere? On eBay? It's for music editing.
  8. macrumors 6502a

    Zeke D

    A soft boot is when you hit restart. A hard boot is when you do shutdown, then press the button to power it back on.
  9. macrumors newbie

    Some news from my Powermac G5:

    today I was able to copy data with my iBook G4, and firewire cable.
    I moved the graphic card (it seems to be ATI Radeon X800XT, but I'm not sure) and reconnected it.
    The G5 started and ran all the afternoon.
    This evening I shut it down, and when I wanted to start it, no response again ...

    Please can you advise me video card I have to buy, because a friend tells me the motherboard's bios can make trouble with some video card.

    Thank you.

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