Screen displaced

[Ancel]

Hi,

I just installed YellowDog Linux 3.0 on my PowerMac G4 with dual 867s, 
an NVidia GeForce 4 MX video card and an Apple Studio Display. When 
everything was installed and I was in KDE my screen was shifted to the 
right so that the extreme right portion of the screen was on the left 
side of it. I tried to fix the problem by adjusting display settings 
but changed something involving the screen width which rendered my 
display unreadable. I'd like to know if there's anyway to restore my 
screen (perhaps load the default settings?) and maybe fix the 
displacement?

Thank You,
Ancel