Getting closer to fixing my 12 inch G4 PowerBook! But I need help..

Discussion in 'PowerPC Macs' started by nickdylan, Aug 6, 2012.

  1. nickdylan macrumors regular

    Mar 17, 2012
    Hey forums! I posted a few months ago about my sad, dead 12 inch G4 (1.5ghz, 1.25gb RAM) looking for help on getting it to run and got lots of helpful suggestions, but I sort of dropped off the face of the earth for a few months until spring semester was over. Now I'm back and have free time and am at it again. Here's what's up:

    When I turn on the G4, it makes the boot up chime and goes to a grey (or white?) screen. No picture at all, just white-grey. It flashes a couple times then stays like that. When I tried to use an external display, the external turned pale blue but that's it. I tried resetting the PRAM, booting into single user mode or safe mode, etc, and got nothing. So I set it aside for a few months until summer came.

    Just today I firewired it with my G4 Sawtooth tower and couldn't read the hard disk. I erased it completely, checked it (no problems), and installed 10.4 on it (10.4 is the only OS installation DVD I have, and it's the one I like best, though I think 10.5 should run on it as well).

    The G4 now works fine with an external display. Progress! Unfortunately, there's still the little problem of that grey-white screen.

    So here's what I'm thinking: There are replacement LCDs on Ebay for like $30, but I'm not sure if the LCD is what's wrong. I mean, it doesn't *seem* broken, there are no cracks or anything. I don't have another PowerBook to test the monitor in, either. Any ideas on what could possibly be wrong with it other than the LCD? I know how to replace the HDD, RAM, and Keyboard but I've never touched the LCD before and I'm a bit nervous about it.

    Any ideas or advice would be very welcome :)
  2. zackkmac macrumors 6502a

    Jul 7, 2008
    According to this thread, one user with the same problem went through three displays with no luck.

    So it could also be the logic board or display inverter. I would take smaller steps first - begin with the inverter, if not then try a new LCD panel, and if that doesn't work, it very well may be the logic board. Also check all internal connections.

    Hope you solve it though. :)
  3. max¥¥ macrumors 6502a

    Aug 7, 2008
    Over there....
    check the lb - > screen cable. I had this once on a g3 ibook after rebuilding it and it was that cable that was unplugged

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