[ubuntu] split screen problem

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http://ubuntuforums.org – Hello, After installing Ubuntu 9.10 I have experienced a problem where my screen is split horizontally. Not just while in Ubuntu, but immediately after powering up. It remains split in Windows, and older versions of Ubuntu that I have installed on USB disks. My screen looks very similar to http://www.flickr.com/photos/37784226@N07/ A person on an Nvidia group reported a similar problem http://forums.nvidia.com/index.php?s...0&#entry944477. He was using ubuntu 9.04 and the problem occurred immediately after ubuntu was released. My system - Dell Vostro 1400 (Laptop - two years and one month old) V1400 CORE 2 DUO T7250 2.00GHZ, 800, 2M DISPLAY : 14.1IN WXGA+ (1440X900) GRAPHICS : 128 MB NVIDIA GEFORCE 8400M GS Any suggestions, anyone having similar problems? Tom (Hardware)