Fedora xen - Mar 2007 - fedora core 6 xen not able to bring up X server

My machine configuration is P4 1GB RAM, 40 GB HDD and COMPAQ SVGA monitor.

I have installed fedor core 6 xen in my machine

X server is not coming up with 2.6.18-1.2798.fc6xen kernel.
xorg.conf is using i810 driver with depth = 24
Fedora Core 6 is installed successfully in graphical mode

When booting,system switches automatically to run level 3.

When i try startx or X or system-config-display , the monitor goes blank and
monitor LED continues to blink infinitely

Few people have faced asimilar problem but i''m not able to find a
solution
for it on the Net.

Any suggestion would be really appreciated...
Thanks....