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Powermac G5 video problems

419 Views 5 Replies Latest reply: Feb 14, 2013 1:10 PM by epwg1 RSS
epwg1 Calculating status...
Currently Being Moderated
Feb 12, 2013 1:00 AM



I have a Powermac G5 Dual processor 2 GHz; I believe it’s the first generation G5 Model.


I got this mac 2 weeks ago, I was told that the video card was probably broken, it seemed to be, no display when turned on.


As a stopgap I used an old PCI Rage card from a B&W G3 and it happily booted from that, as you can imagine the performance was a bit grim but it worked.


I've managed to source an NVidia 5200 AGP card for it but when I put it in the AGP slot and boot it bongs and the fans start normally but the display remains blank, basically exactly the same as the ATI 9600 it came with. If I leave the machine on the fans gradually increase in speed. Pressing the power switch for 5 seconds turns it off


I’ve tried resetting the PMU and tried resetting the Pram but, it seems to not boot to the stage where the keyboard is recognised so it does not reset.


Thinking the new card was also duff I put back in the old PCI card but the machine does exactly the same now as it does with the AGP cards.


I’ve left the machine now unplugged from the wall with the battery removed.


Any ideas what is going on??



  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Feb 12, 2013 2:20 AM (in response to epwg1)

    Sounds like the machine isn't getting to logic; CPU, RAM or logic board issues most likely.

    The biggest trouble with G5 machines is failing solder connections, most commonly around memory controllers and slots.

    This is commonly acompanied by failed POST at startup with the machine beeping or power LED flashing.


    However, the same solder connects all other components to their respective attachments; CPU connections to the card could also be at issue.


    Solder issues are very often sporadic, especially at first, often allowing just enough operation to give a glimmer of hope to a fatal condition.


    Sourcing a copy of the ASD 2.5.8 would give a nice troubleshooting test suite.


    Reseat the hard drive connectors.

    Try booting.


    Try booting to OS X Install Disc.


    Remove the RAM (noting position), reseat, try starting.


    (I would) then reseat the processors.

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Feb 14, 2013 2:21 AM (in response to epwg1)

    Well, it all sounds like fairly positive progress.

    Hopefully it was just crankiness due to age and disuse rather than underlying solder issues.


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