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PowerPC G5 1.6GHz not starting up..please help!

2041 Views 46 Replies Latest reply: Mar 24, 2014 11:47 AM by BDAqua RSS
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Adam Simpson5 Level 1 Level 1 (35 points)
Currently Being Moderated
Dec 30, 2013 8:03 AM

Hello everyone



I should firstly add that I have been having display trouble for a few years now (only showing video after a few restarts), so this may have something to do with what happened the other day, which is as follows:



I was online but on the phone to a friend, then all of a sudden the fans of my PowerPC G5 started going wild, as if the room temperature rapidly increased (I've had this issue before too). The screen cursor from my tablet pen (little arrow) was frozen (don't recall this happening for a long time), so the only thing I could do was a forced restart from the main power button at the front of the G5. It did start up again, but with messed up video (as if I pulled the power cable out of a TV). I thought not to worry, as I usually have video issues and a few restarts usually sorts it out, however the next forced restart produced no video (just a black screen) and more to my concern, no white light or start up chime! Following restarts have been the same.



There is a start up sound when I press the power buttton (I think maybe some brief fans as well), but no light or that power on chime noise. My feeling is that I now have the original video issues combined with a failure of somekind! Please help as I am really worried that this might be something serious.


Does this sound fixable to you guys??


Thanks for reading,



PowerMac, Mac OS X (10.5.8), PowerPC G5 1.6GHz
  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Dec 30, 2013 10:40 AM (in response to Adam Simpson5)

    Hi Adam,


    Have you blown the dust out of it lately? Especially the Graphic card, Power Supply, & CPU heatsinks?

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Dec 31, 2013 12:08 PM (in response to Adam Simpson5)

    Adam, do do the dust first thing.


    Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...


    See which one your G5 has...



  • BDAqua Level 10 Level 10 (114,670 points)

    Whew, it could easily be the Video card, but sadly it still could be other things too, we might tell more with a new PRAM Battery, at least it's the cheapest option to get anywhere at all, Like if it recognizes the KB on startup, or more reliable startup sound.


    PRAM reset, CMD+Option+p+r...



    In fact, do 3 in a row, takes a bit of time.


    How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...



    Earlier G3, G4, G5 models...


  • BDAqua Level 10 Level 10 (114,670 points)

    It shouldn't be possible for those resets to hurt anything, just do one of the PMU resets though.


    I'm hoping the new PRAM Battery might help the KB situation.

  • BDAqua Level 10 Level 10 (114,670 points)

    OK, fingers crossed here!

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Jan 10, 2014 11:08 AM (in response to Adam Simpson5)

    I doubt the Genius bar will help with a G5, they may not even know what one is, & Apple no longer works on them or has parts.


    If we can't figure this out you might find an AASP in your area that'd be willing to look at it...



    I forget, is there 1 LED lit on the Logic board when AC is plugged in?

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Jan 11, 2014 12:58 PM (in response to Adam Simpson5)

    No lit LED would mostly indicate PSU problems, long shot but reseating & cleaning the PSU to Logic board connectors may help.


    Logic Board repair would likely cost more than another, faster G5...



    Yes, open the side door to see LED or if you can fell the HDD spinning up.

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