Power Mac G4 (933MHz) boot problem

Discussion in 'PowerPC Macs' started by hideki, Sep 6, 2011.

  1. macrumors newbie

    Joined:
    Sep 6, 2011
    #1
    Hihi

    Model: M8493 according to the sticker on back

    Had this machine given, arrived sans HDD and with a dead battery

    Fitted a small IDE disk (only 10GB, I'm not awash with IDE disks these days but I got this one to try MorphOS), hasn't changed the behaviour though

    When powered on, it starts up, makes the Boing! sound and turns off...

    If I hold down the button for the open firmware I get a single long beep, a power light flashing very quickly for a second or two, much too fast to count the flashes then the boing! again followed by it powering off

    The keyboard does not initialise and the monitor never gets any sort of signal

    I do not have the monitor/keyboard/etc., so connected a standard USB keyboard and SVGA display, not sure if this should matter

    I still do not have a battery for it but from what I've read it will start without one but the time/date will have to be set every time

    Given the only other mac I own is an SE/30, I'm at a bit of a loss with this one.

    Any help would be appreciated.

    Thanks

    --
    Adam
     
  2. macrumors 68030

    yusukeaoki

    Joined:
    Mar 22, 2011
    Location:
    Tokyo, Japan
    #2
    It sounds like a logic board failure...
     
  3. macrumors member

    Hackint0sh

    Joined:
    Apr 12, 2010
    #3
    Try a battery. My mother-in-law's machine had similar symptoms until I replaced the battery.
     
  4. hideki, Sep 6, 2011
    Last edited: Sep 6, 2011

    thread starter macrumors newbie

    Joined:
    Sep 6, 2011
    #4
    Ahh, which is the logic board, the main motherboard?

    I assume that'd be too expensive to replace to be worth it

    Ahh, that sounds cheaper than finding a mac mini, I'll give it a go, thanks ;p
     
  5. macrumors 68030

    yusukeaoki

    Joined:
    Mar 22, 2011
    Location:
    Tokyo, Japan
    #5
    True.
    Im pretty sure Apple dont replace them anymore so if you want to do it, its either up to your own hands or take it to a shop.
    And it can be pretty expensive.
     
  6. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #6
    try ebay, you can find a logic board cheap. yes the logic board is the motherboard.
     
  7. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #7
    99% it isn't logic board. I've had exactly the same symptoms with few dead graphics cards (long single beep + very fast blinking PLED).
    OP, grab cheapest Mac ATI Rage/GF 2MX you can find (try CL maybe) and try it.
     
  8. macrumors 68020

    zen.state

    Joined:
    Mar 13, 2005
    #8
    Try resetting the PMU and a new battery. Although G4 towers will all normally start without a battery if there is a PMU issue you need the battery for the second or so that you reset the PMU.

    Don't press the button more than once as you could crash the PMU and drain the battery.
     

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