Need help with G5 Power issues please Model A1047

Discussion in 'PowerPC Macs' started by Mrbill317, Jul 8, 2010.

  1. macrumors regular

    Jul 17, 2007
    have a G5 Power Mac (Dual 2ghz). and it will not power on. I plug in the cord and here a power click.
    I depress power button and light comes on for a sec and goes out. Front fans do a quick partial spin and thats it.

    Is that a bad power supply? This isnt easy to get out and can be expensive right?
  2. macrumors 68040


    May 20, 2010
    Boulder, CO
    i just acquired the same model powermac and i have the same issue... i would also like help, although im afraid that both of us are suffering from a failed logic board.. :( :eek:
  3. thread starter macrumors regular

    Jul 17, 2007
    Shouldnt be the case

    My unit was fully functional before placing in my bedroom closet (I have a Mac Pro now). It wasnt connected to anything in there , how in the blazes did it blow the logic board.
    Unit wasnt even used much before
  4. macrumors 68020


    Oct 6, 2007
    Australia (WA)
    Doubt it will be the motherboard, I have just had a Power mac in at the office. with the same problem. I dismantled and checked the power supply no signs of bulging capacitors or any internal damage with the power supply.

    I have a college that has a working powermac i grabbed his psu out of his and put it in the customers and it fired up straight a way.

    if your game enough, strip it down, you will need to remove both cpu's the front fans / back fans ( make sure u label the cpus according to there position top / bottom) remove the 4 screws under the case psu should come up, may need some force to get it out so be careful.
  5. macrumors 601


    Sep 16, 2007
    Northeastern Ohio
    I have a good 600w PSU laying around that you can use to test yours if you think you can change it yourself. If you're near Cleveland, I'd do it for free for you. I also have service manual if you need it.
  6. macrumors 68040


    May 20, 2010
    Boulder, CO
    it is either the psu or the ram, i believe
  7. macrumors 68040


    Dec 7, 2009
    RAM you can for sure exclude of your "suspicions list".
    It looks like PSU (from described symptoms), I bet on its capacitors. If unit was unused for a long time, they could simply dry-out. It happens sometimes, especially with "not best quality" capacitors.
  8. macrumors 68000


    Jul 25, 2008
    Wichita KS
    Sounds exactly like what happened with the 1.6GHz Powermac G5 I had a couple years ago. I made this YouTube video showing the problem. Watch it, and see if your problem is the same. I replaced my PSU and it didn't fix the problem. To this day I'm not totally sure what was wrong with it, but I am almost 100% sure it was the logicboard.
  9. macrumors newbie

    Jun 24, 2010

    If it was unplugged for a while, it may be the battery - it's a 3.6 volt Lithium battery.

    Mine was like that (same model, same problem), didn't get a chime or anything until I replaced the battery. (full disclosure, my machine is still not working, but at least it chimes before it hangs on startup)
  10. macrumors newbie

    Jul 13, 2010
    Could you send me the service manual

    If it is in PDF that would be great if not where could I get a copy?

Share This Page