I dont seem to find any reason for your display problems. However, ensure that you have installed the appropriate device driver for you NVidia GeForce card and it was correctly detected during setup. Try checking it with knoppix 3.7 availabe at www.knopper.net
and checking your display.
If you are experiencing same problems, there might be a possibility, (if u are having problems in windows, if u have one) that there is something wrong with the card or the transmission through the wire.
Try finding posts related to this topic, because there are many issues in the past regarding drivers for Nvidia.
You might receive a solution very quickly..GO ahead!