X-server doesn't start after boot-up

[raman narasimhan]

i've a debian etch system.. i'm using the grub loader.. immediately after
the boot process when the login screen is to take over, instead of the login
screen, i get this

...................
| Hz          ?  |
...................

this box keeps moving up and down on the screen..  i'm new to linux so dont
know how to configure x by myself.. pls help
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