out of synch screen after boot

[Ashutosh Sharma]

1)I have installed ubuntu Server 9.0.4 edition on my Dell Studio 15 laptop
with dual boot(with Windows Vista 64 bit)
2)It was working fine. Later i did apt-get ubuntu-desktop(not sure about the
command-but it worked fine)
3)It was also working fine but it changed my boot screen, now i directly go
to GNome Desktop rather than the shell prompt for login.
4)It was working fine but i wanted to set up my graphics card which is ATI
Raedon 3400 -256 MB card. After that as and when i reboot-i get a garbled
screen with out of sync colors. Please go thru the screen shot.The first
screen is a snapshot when it reboots.
5) As i cannot enter anything-i tried "Ctrl+Alt+F7" to get terminal login.
But i get the second screen.
I tried recovering using server install CD but no success.

Is the only way out is to reformat and re-install?

Can somebody provide me kernel parameters and how to enter at GRUB boot
loader so that i can go to the shell prompt and do the needfull

Any help is highly appreciated.




-- 
With best Regards:
Ashutosh Sharma
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