Hi, I recently tried to install a graphics card on my computer to replace the on-board video. When I turn the computer on and select ubuntu 9.10 at grub ( I have dual boot with xp) my screen turns into black and white stripes which I cannot do anything with, no login for command prompt. I know the video card works because i have configured to in windows fine. I am relatively new to linux and realise that I am probably doing something stupid but any help would be appreciated. Thanks