PM G5 2.7GHz goes into overdrive, no chime

Discussion in 'PowerPC Macs' started by maxmaxsmith, Aug 31, 2010.

  1. maxmaxsmith macrumors newbie

    Aug 31, 2010
    I've had this G5 (2.7GHz, 1.5GB Apple RAM) since around February or March and for quite some time it made two clicking sounds and that was it. Today at around 6:40 I was just about to go pick up another G5 also a 2.7GHz for parts to replace the power supply. Right before I left, I plugged my Mac in one last time and poof, it turned on. I couldn't believe it, right before I went to replace it the G5 came back almost as if to say "not so fast".

    Now what's happening when I press the power button is:
    fans spin up, then slow down to normal speed
    hard drive spins up
    no chime
    front LED only comes on when it is pressed
    red LED on one of the processors
    after approx. five minutes fans speed up and after ten minutes they are at terminal velocity
    will not communicate with any peripherals
    only way to turn it off is pressing the CUDA or pulling the plug

    Things tried:
    CUDA reset
    cold start

    Some more info on the machine:
    RAM is tested and good
    DVD-RW is good
    all fans run
    I don't have the original disks
    I don't have a monitor for it (since it never worked)

    Any help would be greatly appreciated, as my iMac is really showing its age and finances are tight.

  2. raysfan81 macrumors 6502a


    Oct 6, 2009
    North Carolina
    The dual 2.7's were liquid cooled and were infamous for leaking. Sometimes a leaking system can cause the fans to run at full speed. When you are looking around in the case make sure you don't see any liquid or corrosion near the processors. Also, make completely sure all the sticks of ram are working (try them one at a time if necessary) good luck!

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