YLD 6 - Display problem

Hi,

I have a G4 MDD with RV250 (radeon 9000) and LCD Acer 1951
plug in DVI. 
The problem is when i start the X-window the refreshing rate
seems to be 
inadequate and I have diagonals refreshing stripes on my
screen with  
RGB colors.  I have try to change config (video card setting
and 
monitor) but  this won't fixed the trouble. Anybody has a
solution ?
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