Unstable screen distortion after startup - scrolls left to right rapidly

My Mac Mini (2.0/2GB/GMA 950) will not provide a stable screen after startup process completes - the screen rapidly scrolls left to right (possibly right to left, cant be sure) and the mouse pointer appears broken up until I move the mouse to the lower right corner of the display.
I can get a menu bar menu to drop down, then move the mouse to the corner to stabalize, then use the keyboard to active available commands - but any movement of the mouse cause the screen to resume the instability.
this only occurs after the initial staup process completes - the startup icons display normal until the loging window or desktop is displayed - then the display goes unstable, scrolling horizontially rapidly.
This occures in any display resolution I can access, with alternate mouse & keyboards, and even without mouse or keyboard. Also occurs after changing back to original 2x512 memory modules.
This also occurs with a clean statup from the original installation DVD as well as a 10.5 & 10.6 installation DVDs which suggests a Hardware failure.
However when I boot into Windows XP using the BootCamp partition the system behaves completely normal - no display problems what so ever.
Any suggestions on how to narrow this down to a software driver or hardware? Any notices from Aplle that relates to this to a hardware problem?

Hi. After a 'hard shutdown' - such as pulling the plug - the boot directory may be damaged. It may help to boot from the most recent system disc DVD that you have - could be the 10.4 retail disc - and use Disk Utility to Repair Disc
If Disk Utility finds errors it cannot repair, you could try DiskWarrior
You can boot from the DiskWarrior CD and run it - or download it to the laptop and run it, from the laptop, on the G5 internal boot drive, via firewire TDM
If none of this helps, please post again. Good Luck.
PS Have assumed you are on 10.4 - for 10.3 boot drive repair see
Oh - and if you are on 10.4.3 or higher - if Disk Utility on the system DVD repairs the boot drive ok, you may then wish to run the Disk Utility > Disk Verify (the one on the 10.4.3+ boot drive) - just to check. More Good Luck.

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