trouble after update xorg- * rpms on FC3

[Yuandan Zhang]

Hi,
I  normally keep my system updated (FC3) using yum. However, after I 
updated  xorg rpms, for example,

xorg-x11-6.8.2-1.FC3.13.i386.rpm      to xorg-x11-6.8.2-1.FC3.45.i386.rpm,

the xterminal can't be booted. I can only boot the system by set the 
default boot level to 3. The Xwindow just displays a smear  screen and  
not reponding.

How to fix it?

Thanks

Yuandan