I did check the /var/log/XFree86.0.log. The error are:
(II) R128(0) Not using default mode "640x480" (hsync out of range)
(II) R128(0): not using default mode "320x240" (bad mode
clock/interlace/doublescan)

What should I do to trigger the problem.
I know the X server is running, when I reboot the system I notice that.
Thanks.

cljlk wrote:

> I just install RedHat9 into my Laptop. When it prompt the login, the
> screen keep falshing. Eventually, I type in root and password, then
> login into root account. A error show on the screen "couldn't start X
> server". Please help.
>