IM USING ACER ASPIRE 4750G LAPTOP AND RUNNING UBUNTU
VGA card : GT 540M CUDA
Distributor ID: Ubuntu
Description: Ubuntu 10.04.2 LTS
I have installed the latest official driver from nvidia web site. After that when im going to start the X server it give me device not found error and not starting the X.
For your reference you can check the xorg.log file from below link.
I searched this this issue thru web from few days and still no luck.