G4 TiBook, grey screen logic board error?

Discussion in 'PowerPC Macs' started by jrindfuss, Apr 2, 2008.

  1. jrindfuss macrumors newbie

    Apr 2, 2008
    Hi ... I have a G4 Powerbook, Titanium 15". I'm not positive of the processor speed right now ... running OS 10.2.8.

    I started having problems with it a few weeks ago ... crashed a couple of times and I decided that it must be the hard drive. I replaced the hard drive and reinstalled OS 10.2 and then ran all the necessary updates. I was using it for one day and then my monitor stopped working. I can't remember what initiated this issue ... I think it was in sleep mode and when I woke it up, it was just a grey screen. I tried many things without any luck ... it will not start from Nortons Emergency disk, will not start in safe mode, will not start from original disks. I can't remember if I tried to start it with the Hard Disk Recovery disks, or not. I have not tried to attach it to another monitor, just because I don't have access to one and I also have not yet tried to start it via Target Disk Mode, just because since it won't start in safe mode, I didn't think that would work anyways. When I try to restart it, I do hear the chime at start and at one point, I could also hear my email chimes/alarms in the background, but I just couldn't see anything.

    After reading lots of postings, I decided that it must be a bad display so I located a replacement and actually replaced that. But, when I tried to restart, I had the same grey screen! Then I was reading on another post about trying the reset button underneath the keyboard ... I tried that and now I have a black screen, not grey any more. I still hear chimes on the start, but not sure if I've heard any email alarms, or not. I don't think I've left it on long enough to test that for sure.

    So .... my question is does this sound like a logic board issue? If I'm getting a chime at start, can it still be a bad logic board? Or, could it just be a bad cable that controls the display? Since I could hear my software alarms, I'm thinking that the hard drive and OS is ok, but I just can't see anything.

    Any suggestions would be greatly appreciated!
  2. NIPRING macrumors 6502

    Jan 19, 2008
    Waukesha WI
    Sorry to hear that but yes it sounds like the logic board is dying.:(
  3. jrindfuss thread starter macrumors newbie

    Apr 2, 2008
    How to replace logic board?

    I was thinking the same thing, and I don't have any problem replacing the logic board. I actually had it out already when I replaced the display ... but is it that straight forward? Just locate a new one, pull out the old and replace? Seems too easy .. I know I need to be careful with how I handle it and with getting everything back into the right places, but is there anything else I need to know? I was reading somewhere about a paste to put between the board and processor? What is that about?

    Any help or suggestions is very much appreciated!
  4. Sweetfeld28 macrumors 65816


    Feb 10, 2003
    Buckeye Country, O-H
    Just just called in my Powerbook 1.25, to Apple to get fixed. My Airport port quit working. They told me it would be $385 to get my motherboard replaced. $100 just to look at it, non-refundable mind you, and another $200+ for the install+labor.

    Suddenly, a newer Macbook is looking better to me now.

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