is ther any way to make nvidia gtforce GT540M work on bt5?

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http://www.backtrack-linux.org – 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 (HowTos)