G3 Video Problems

Discussion in 'Mac Basics and Help' started by .:*Robot Boy*:., Jun 12, 2005.

  1. .:*Robot Boy*:. macrumors 6502

    Jan 21, 2005
    New Zealand
    My old blue and white G3 is having some strange video problems, my guess is that the video card needs to be replaced, but maybe (read: hopefully) I'm just jumping to conclusions.

    The most annoying problem is that it seems the lose the red component of the video for long periods of time, thus giving everything a blue tinge (I guess it's the red component, I'm not too good with my colour theory :eek:).

    At first, I thought it was the display (which I recently bought to replace my dead Apple CRT display) - but I've since tried it with my PowerBook and had it looked at by a tech and I'm convinced that this problem has nothing to do with the display itself.

    The second problem is that, during startup, the video is displayed as per usual (grey screen, Apple logo, spinning... thing), but the screen goes blank when the log-in screen (or the desktop, I can't remember how I have it set up) would usually appear. I know the computer is working as I can access it from Remote Desktop.

    Are there any diagnostics applications I can use to check the video card? I tried Tech Tools 4 and it said it was fine, but I've never really trusted Tech Tools. I know my PowerBook's Panther discs have a hardware test application, but the Panther retail discs for my G3 are probably sitting at the bottom of a series of different boxes in a cupboard somewhere :(.

    So, any ideas? Or should I just start looking on eBay for a new graphics card :rolleyes:.

  2. spinne1 macrumors 6502a


    Mar 12, 2005
    Hermitage, TN USA (near Nashville)
    More info would be helpful. Which motherboard? What video card? What monitor? Before anything else try a known good monitor. Then you'll know better what it could be.
  3. James Philp macrumors 65816

    James Philp

    Mar 5, 2005
    Try starting up the PM in taget disk mode (hold down "t" key during startup.
    Connect to your PB to the PM via a FW cable.
    Re-start your PB while holding down the "option" key.
    Select the PM HD in the volume list.

    Your PB will now start up using your PM's drive. Now you can check what settings your screen prefs are set to. Try trashing them or changing them, shutting everything down and connecting the display again and firing it all up again!
  4. .:*Robot Boy*:. thread starter macrumors 6502

    Jan 21, 2005
    New Zealand
    It's the Rev. 2 motherboard with a stock ATI Rage 128 16MB video card. The monitor is an incredibly ugly, dark-grey, 'Phillips 107S66' CRT which I'm running at 1024 x 768 @ 75Hz.

    I had overclocked the G3 from 350MHz to 400MHz but have since put the old jumper block back on in case this was causing a problem.

    I'll try another display and trashing the preferences tonight and see what happens. Thanks guys.


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