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

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

  1. dummptyhummpty macrumors regular

    May 4, 2005
    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. reddrag0n macrumors 6502


    Oct 1, 2007
    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. bizzle macrumors 6502a

    Jun 29, 2008
    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. paulie3509 macrumors newbie

    Oct 10, 2011
    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,
    Hope this helps someone.
  5. panteaze macrumors newbie

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

    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. Nameci macrumors 68000


    Oct 29, 2010
    The Philippines...
    You might want to try to replace the gfx card?
  7. havokalien macrumors 6502a


    Apr 27, 2006
    Kelso, Wa
    G5 issues

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

    Jul 29, 2009
    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. OrangeSVTguy macrumors 601


    Sep 16, 2007
    Northeastern Ohio
    Check for leaks in the liquid cooling system.

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