Old iMac G5, black screen on startup

Discussion in 'iMac' started by Flenix, Aug 18, 2013.

  1. Flenix macrumors newbie

    Joined:
    Sep 5, 2012
    #1
    Hey guys,


    The other day, I got a free iMac G5. When I got it, it was literally the machine only - no mouse, no keyboard... even the RAM and HDD was removed!

    Anyways, I pinched an official 512mb RAM stick from an old powermac G5 I have kicking around, and put in a spare blank small HDD. Powered it up, and got that good ol' chime - then, nothing.

    There's no sign of it doing anything, but the power light does stay on. The screen stays black, not even a backlight.


    On Yahoo Answers, someone suggested there might be a dead PRAM battery. Thought it seemed a little strange, but I had replacement batteries spare so changed it just in case, and the issue wasn't fixed.

    I've checked the caps, they're all absolutely fine.

    It's a 2004 model I believe. 17" A1058 - shipped with 512mb ram and a 160GB HDD. Currently using a different 512mb stick (still Apple) and a blank 80GB drive. There's no OS installed but I've got a copy of Leopard waiting for it if I can get the screen on.


    Anyone got anything to suggest? I don't want to spend tonnes on it but I wouldn't mind spending a little to fix it myself. At the end of the day I'll probably sell it once it's working (specs aren't high enough for the kind of stuff I would do with it), so it has to be worth whatever I spend on fixing it.
     
  2. Mr Rabbit macrumors 6502a

    Mr Rabbit

    Joined:
    May 13, 2013
    Location:
    'merica
    #2
    Is this an iMac with an iSight camera built into the top of the front bezel? Have you attempted to reset the PRAM and SMU?

    To reset the PRAM:
    • Connect your iMac to power
    • Hold Command+Option+P+R while pressing the power button
    • Keep holding the 4 keyboard keys until you hear a second, usually louder, chime
    • Release all 4 keys

    This Apple KBB article walks you through some basic troubleshooting, including resetting the SMU, with an iMac G5.
     
  3. Flenix, Sep 6, 2013
    Last edited: Sep 6, 2013

    Flenix thread starter macrumors newbie

    Joined:
    Sep 5, 2012
    #3

    I'll try that, but I don't have a Mac keyboard. It's not an iSight model though.
    Any ideas what keys I should use from my generic cheap windows keyboard?

    EDIT: Tried the KB article. I've only got one button there so apparently my SMU is reset automatically by unplugging it, but nothing on that article helped. When I put in the power cable the first LED came on, when I powered it up the second one came on. As far as that article knows, everything works.

    EDIT 2: Found out with windows it should be winkey and alt instead of command and option. Tried it, and nothing happened. No chime or anything, so guessing it didn't work. But, I had replaced the PRAM battery before, which I would assume would have reset the PRAM.

    I get the feeling either the screen or the graphics card is probably dead. Anything else I can try before I resign myself to that?
     
  4. Saltymac macrumors member

    Joined:
    Aug 19, 2013
    Location:
    Rocky Mt State
    #4
    Try a second monitor and see if you get anything on it. Check your ram again. Go to Everymac and download the user guide for it and read about troubleshooting.
     

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