hi all
i have acer aspire with nvidia geforce gt 540m
i have follwod installtion instrction but without luck
i get the following error

fetel error
no screens found

i have checked the Xorg.0.log file and noticed that the primary device is intel not nvidia while it has loaded the nvidia drive?

also i have googled and tried many solutions but none works also search the forum too

one of the solution i have tried is to add the busid for the nvidia card but when i type startx the sceern get black.

any ideas

note this is a custmized bt form backtrack.com
and i have used that last nvidia driver update from the nvidia website.