iMac G5 won't boot

Discussion in 'PowerPC Macs' started by Cams, Feb 9, 2010.

  1. macrumors regular

    Joined:
    Nov 7, 2006
    Location:
    Isle of Arran, UK
    #1
    I have an iMac G5 (the one with the iSight). When I switch it on, the white power light on the bezel comes on but that's it. Is there any way of running a diagnostics check on it?

    The hard drive was recently replaced and I'm wondering this: what would the symptoms be of a failed HDD? On Windows I know it will say something like Invalid System Disk or No Disk Found. What would the iMac do? Would the LCD still power up even if the drive was faulty?
     
  2. macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #2
    You would still get a powered up LCD and a picture of a folder with a question mark on it. Try resetting your PRAM and PMU (remove the plug and press the power button for 10 sec). Could be a loose connection inside made when the HD was installed.
     
  3. thread starter macrumors regular

    Joined:
    Nov 7, 2006
    Location:
    Isle of Arran, UK
    #3
    Unbelievable -- it worked! Thanks so much. Can you explain a little what parameter ram and PMU are, or provide a link to such info? It would be useful to know what i just did.
     
  4. macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #4
    Sure. PRAM is in my sig and resetting G5 SMU/PMU is here.

    Parameter RAM is just a little permanent RAM that stores various configuration data. SMU/PMU is a small controller that controls various power aspects of the Mac.
     

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