Display image not aligned properly

My daughter occasionally uses an older Power Mac G4 (PCI Graphics), connected to an Apple Studio Display 17 (LCD) via a VGAtoADC conversion box. The computer still has the original ATI Rage 128 card in it.
Recently, after upgrading to OSX 10.4, we now have a 1" black bar running from top to bottom along the right side of the display - and the left side of the screen is cut off by about an 1". If I go back and boot from OSX 10.3.9 it works fine.
Could this be a PMU issue? Or have I finally over-extended the range of that old ATI Rage card?

Thank you for the tips...Yeah, we did all the updates, and followed most of the troubleshooting tips (deleted the Library/Preferences/com.apple.windowserver.plist and ~/Library/Preferences/ByHost/com.apple.windowserver.xxxx.plist, and reset the PRAM.) Tomorrow I'll reset the PMU. Works fine on Panther, so it's not the connections. A real head scratcher...

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    7. At the ">" prompt type:
          reset-nvram and hit the Return key
          set-defaults and hit the Return key
          reset-all and hit the Return key
    the last command will restart your mac
    8. Shut down your Mac
    9. Connect all your FireWire devices to the Mac and turn them on
    10. Restart your Mac.
    All your FireWire devices should reapear, if not repeat the procedure
    How to avoid the issue :
    The only really proven way to avoid burning up a FireWire port is to connect all devices and to turn them on PRIOR turning on the Mac. Likely, one must unplug them and turn them off AFTER the Mac has been turned off. If you need to connect another device, then you're on for a shutdown of your machine... 
It's a tad annoying but it guarantees that the FW ports won't be damaged. 
Be careful when using self powered devices such as webcams, iPods, hard drives or hubs, as they can destroy the port pretty easily. Another thing is to avoid daisy-chaining hard drives.
    When the FW port doesn't respond anymore :
    In this case, peripherals won't be mounted upon plugging, and won't be displayed in Apple's System Profiler. The self powered devices will still be fed by the port, but won't respond either. 
It happens that the PHY just hangs after a surge or a random problem. Once hung, the port will not respond any longer, it is possible to reset the component by going through the following steps :
    1° boot the mac in Open Firmware by holding [ Apple key - Option - O - F ] after the startup chime. 
2° you'll get to a command prompt. the keyboard mapping will be QWERTY, so pay attention when you type the following : 
RESET-NVRAM (enter) 
RESET-ALL (enter) 
3° Now the mac should restart itself and the port should function properly again. 
If it still doesn't work, then it means that the PHY is damaged.
    http://www.hardmac.com/articles/16/

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