help for iMac G4 monitor

Discussion in 'Mac Basics and Help' started by iaio80, Nov 24, 2005.

  1. iaio80 macrumors newbie

    Nov 24, 2005
    Hi everybody!
    I'm new to this post and I find it really useful.
    I recently bought an iMac G4 17" superdrive, but the screen is white. I mean that when I switch the computer on, I heard the "gong" sound, the monitor turns on but it becomes white! nothing happens anymore. I can't se the apple logo and the loading of the 10.4 operative sistem. Can anybody help me please? I think it could be the signal cable (because the power is working and the monitor is on). Am I thinking in the wright way? Does anyone know a link to disassemble the monitor stand in order to check the monitor cables?
    thanking you in advance, I look forward to hearing some answers. regards, dario.
  2. mklos macrumors 68000


    Dec 4, 2002
    My house!
    The signal cable could be the problem. Working on iMac G4's is a pain in the butt. Its not really hard to get into, but its the crap you have to do before putting it back together.

    You'll need some thermal paste as a torx screw driver. After you take the bottom plate off, you'll see the RAM and AirPort slot. In each of the 4 corners you'll see 4 torx screws. You'll need to take them all the way out and then the bottom will flip down. Be very careful of any short wires that you may yank out while tipping the bottom downward. The video cable may be one of those short cables. You can just reseat the video cable. If that doesn't do it, then there's probably something wrong internally with the display, or the video chip has a problem or some sort.

    Also note: There's thermal past around where the heat pipes come together with the top and bottom parts of the dome to help it cool. You'll need to scrape the old thermal paste off and put new thermal paste on (DO NOT OVER DO THE PASTE!!!!). A simple small ball of thermal paste will do it. This aids with the cooling process on the iMac G4. Also take note that if you leave it open for a long period of time, you'll need to replace the heat pads, which are virtually impossible to get as they're only available from Apple. So don't have it open for a long period of time. No longer than a couple of hours.

    If it has a mini VGA Port (mini VGA to VGA adapter required, but not supplied) then you can use an external display for a while if the internal display still doesn't function.

    Here is a take apart link:

    Good Luck!
  3. iaio80 thread starter macrumors newbie

    Nov 24, 2005
    Thank for your prompt replay.
    I opened as described in the ilnk the iMac, but the video cable seems to be properly connected. Now I'm thinking the problem is upper, in the stand cable or connection. Does anyone now how to open the stand? Do I need a special tool? I'm without any new idea about what the problem can be. Has anyone any suggerstion? Thanking you in advance. dario.
  4. Will Cheyney macrumors 6502a

    Will Cheyney

    Jul 13, 2005
    United Kingdom

    How do they design these things? The Cube and Mini are internal circuitry design wonders too!
  5. Gokhan macrumors 6502a

    Oct 7, 2003

    apple repalced my arm but no idea how they did it !!!!

    sorry it is doable though
  6. iaio80 thread starter macrumors newbie

    Nov 24, 2005
    Thank for the information.
    I'm thinking about taking it to the apple store here in Birmingham. :( I'm quite afraid of the cost of the service. does anyone know how much can it cost? obviously it'll depend by the entity of the problem. thank to everybody.dario.

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