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
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
If Disk Utility finds errors it cannot repair, you could try DiskWarrior
http://www.alsoft.com/
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
http://docs.info.apple.com/article.html?artnum=58583
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
http://docs.info.apple.com/article.html?artnum=162662
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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