iMacG4 grey screen problem

Discussion in 'PowerPC Macs' started by abasak, Dec 5, 2007.

  1. abasak macrumors newbie

    Dec 5, 2007
    Hi. I'm new here (posting at least.. longtime lurker).

    I have a pretty wierd problem with my imac g4, and would really appreciate any help I can get.

    Thing is I got hold of a 1ghz 17" iMac almost for free, it had a dead logicboard (I checked it with a voltage-meter), but I figured I could fix it and have a small hobby project-thingie going on. Well I just got a new logic board today, for a 1ghz 17" iMac g4.

    And it works. Well almost.

    Things is I only get a bright grey screen from my Mac when I boot. I've tried connecting it to a external display and that works fine. Everything is there.

    I then reinstalled Tiger on it, with the computer connected to my external screen. And I still have the same problem. (I have now disconnected the ext. screen and is controlling the iMac from my MBP). So at least it isn't the installation.

    So what is the problem? I can via an Apple Keyboard control the brightness on the blank screen, which would indicate that it does react to input of some degree.

    I've read that if the inverter is dead or anything else is dead, you would get a rolling grey screen, flicker or something like that and not a steady bright grey.

    Do you have any ideas?

    One thing I'm thinking is. What if somehow this logic board was for a 15" 1ghz imac g4? Can I check this?


    I read that long thread about guys buying hi-res displays for their MBPs, and they had to replace some display profile? Could I maybe fix it with a different display profile-file?

    I'm really confused by all this, and would appreciate any help I can get.

    Thanks in advance.

    oh by the way, this is some of the info I get:

    Model: PowerMac6,1
    CPU-Type: PowerPC G4 (3.3)


    the gfx chip is a GeforceMX4 with 32mb.

    The display is a mode 9c27, manufacturer 610, serialnumber 00000, manufacture date: B84D7200.

    Dunno if it helps?
  2. gageray macrumors newbie


    Nov 10, 2006
  3. abasak thread starter macrumors newbie

    Dec 5, 2007
    Thanks. I just found out the same yesterday... I'm trying to let the deal go back... :) Hope it works.

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