12" PowerBook G4 stoped working. Won't even turn on.

Discussion in 'PowerPC Macs' started by LimeiBook86, Jan 17, 2007.

  1. macrumors 604

    LimeiBook86

    Joined:
    May 4, 2002
    Location:
    Hanging around in NJ with his cutie. :)
    #1
    I have a 12" PowerBook G4 Rev A (867mhz, 80GB, 640mb DVDR, Wireless) that suddenly stopped working today. I had recently serviced the computer and upgraded it's 40GB hard drive to an 80GB hard drive. That was last week, and everything has been working fine.

    I was using the PowerBook at a friends house where I shut it down. Later I drove home with the PowerBook in it's bag. When I came home to turn on the PowerBook the computer chimed up and the hard drive spun-up. The computer started up except one thing was wrong. The backlight on the display was off. This has happened about a month ago with the backlight not being on, after a restart or two the problem was fixed. So I restarted the machine to see if it would help.

    Now the computer will not turn on at all. I took out the additional Memory stick, the battery, and tried to boot it up with just the AC adapter. If I press the power button I hear the speaker pop (which should be followed by the chime, but it's not) and the high-pitch noise goes away. The hard drive doesn't spin up, it just sits there. If I hold down the PowerBook I hear a high-pitched squeal. If I remove the AC adapter the noise stops, I've tried two AC adapters and this happens with both of them. The machine is just sitting here not booting up. If I have to open it up again I will but, I'm curious what happened to it.

    Also, I plugged in the video adapter to the TV but, I get no video. Also, when plugged in (or when on battery) when I press the power button, after it pops, I can press the Caps Lock key, which lights up the LED. That's the only sign of life I can get from the machine.

    Any ideas? Thanks :eek: :(
     
  2. Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #2
    Hmm... Is it any different if you try starting in Safe or Verbose Mode? :)
     
  3. thread starter macrumors 604

    LimeiBook86

    Joined:
    May 4, 2002
    Location:
    Hanging around in NJ with his cutie. :)
    #3
    Unfortunately no. It doesn't make a difference since I don't think the machine is actually booting up. I guess I'll be sending it out to MacResQ.com, it's only $49 for them to check it out. I took it apart and unplugged basically everything one at a time and I got nowhere. Even with the speakers unplugged (which I thought was making the high-pitched buzz) it still makes a noise. I'm guessing maybe some metal is touching something but, I can't find out what.

    Oh well :) I guess I'll go fix my Lime iBook's Hard Drive and I'll use that for now I guess. :eek:
     
  4. macrumors member

    Joined:
    Aug 23, 2006
    #4
    My G4 died in a remarkably similar manner a couple of months ago. Turned out to be a dead logic board.
     
  5. thread starter macrumors 604

    LimeiBook86

    Joined:
    May 4, 2002
    Location:
    Hanging around in NJ with his cutie. :)
    #5
    I just took it apart again. I found out the sound was actually coming from the battery board (next to where the trackpad is). I removed it and I no longer get the high-pitched squeal. The machine still won't boot however, hmm.:confused:
     
  6. macrumors member

    Joined:
    Dec 10, 2004
    Location:
    New Hampshire
    #6
    Sorry to revive such an old thread. But the exact same thing (high pitched squeal coming from the DC-DC board) just happened to my 12". Any chance you ever figured this out?
     
  7. thread starter macrumors 604

    LimeiBook86

    Joined:
    May 4, 2002
    Location:
    Hanging around in NJ with his cutie. :)
    #7
    Sorry, but no I never found out what the problem was. :(

    I remember the night it stopped working it was in my car which was very cold. Then I brought it inside. Maybe there was some condensation? I'm not sure. But it still doesn't work, but I still have the parts. I suppose a new logic board should do the trick. Unfortunately those are also costly. :(
     

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