Error with startx

Hello there I have download suse 11.1 Dvd and i installed it today.The installation was successfull done.I install gnome not kde.
When i am in command line i give the user name and pass.
I want to use gui and so i write startx but it returns some problems.
I have an ati radeon x1950 pro graphic card and the error that startx gives is:
xauth:creating new authority file /root/.serverauth.21891/etc/x11/xinit/xserverrc:line 56:exec:X:not found
xinit:server error

Whats going on here?Whats the problem?

Maybe try

su -
sax2 -r -m 0=vesa

To switch to the vesa driver. Then ‘exit’ to log out, log in as normal user, and try startx again.