Dead PowerMac G5 (PS, Logic Board, etc?)

Discussion in 'PowerPC Macs' started by dummptyhummpty, Aug 17, 2011.

  1. macrumors regular

    Joined:
    May 4, 2005
    #1
    I've got a PowerMac G5 DP 2.0ghz (June 2004) that is completely dead. When I connect the power cable the power supply click-clicks, but that's it. At first the power light would briefly light up, but it has stopped doing so. There are no diagnostic lights either. I verified that I'm getting +5vdc across pins 1 and 23 on the power supply and I've replaced the PRAM battery (which was missing). I'm not sure what else to check, could this be a bad power supply, logic board or something else? Thanks!
     
  2. macrumors 6502

    reddrag0n

    Joined:
    Oct 1, 2007
    Location:
    Canada
    #2
    My G5 did the same thing, it would click when i plugged the power in, and click when i unplugged it. Nothing would respond, no power button pressing, no pram battery swap, nothing. I found out that the 600W ACBel power supply was bad and swapped it out for a Liteon 600W power supply from a DP 2.5 GHz G5. After that, she would start right up with no issues.
     
  3. macrumors 6502a

    bizzle

    Joined:
    Jun 29, 2008
    #3
    Slide the fan out and bang on the top of the power supply and see if it turns on. If it does, something is loose in there. This is worked for me on more than one occasion.
     
  4. macrumors newbie

    Joined:
    Oct 10, 2011
    #4
    mine is exactly the same

    I know this post is a couple of months old now but wondering if anyone found out for definite what the problem is?
    I have tested my power supply and it seems to be fine try this link to see how you do this,
    http://www.youtube.com/watch?v=EKQo-leT6HQ
    Hope this helps someone.
     
  5. macrumors newbie

    Joined:
    Mar 28, 2008
    #5
    help me diagnose my MAC G 5 BLACK SCREEN, powers on

    Hello,
    Can anyone help me diagnose my power mac g5, dual core 2.7ghz processor. Computer powers on, led lights up, chimes normal, black screen. I replaced the 3.6v battery, and reset the smu, still black screen. Is this a power supply issue? Any help would be greatly appreciated. Thanks in advance.
     
  6. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #6
    You might want to try to replace the gfx card?
     
  7. macrumors 6502

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #7
    G5 issues

    G5 known issues are bad solder and dead CPUs.
     
  8. macrumors regular

    Graveyard

    Joined:
    Jul 29, 2009
    Location:
    Romania
    #8
    I have two dual cpu G5 machines. Both of them have one of the processors gone bad. I had to run ASD to make sure. Why don't you try and do the same?
     
  9. macrumors 601

    OrangeSVTguy

    Joined:
    Sep 16, 2007
    Location:
    Northeastern Ohio
    #9
    Check for leaks in the liquid cooling system.
     

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